Radical Formula

In mathematics, an expression with a root is referred to as a radical. A radical can be used to describe various types of roots of a number, including square roots, cube roots, fourth roots, etc. For example, common radicals like the square root and cube root are expressed by the symbols √ and ³√, respectively, where “3” is the degree or index of the number. If the index of the radical is not mentioned, then it is considered a square root. The word “Radical” is extracted from the Latin word “radix” which means “Root”.

Radical in mathematics are similar to the roots of the number. Any numbers expressed as root, nth root, or others are called radicals. For example: ∛(12), For example: √(5), (11)^1/5, etc. all are radicals. Let us consider an example to understand the concept of radical better.

In the figure shown above, “n” is the index of the radical, “(a + 3b)” is the radicand, and “(ⁿ√)” is the radical symbol, and it is symbolically written as “nth root of (a+3b).” The index of a radical helps to determine how many times a number must be multiplied by itself to equal a radicand. And also an index of a radical is regarded as an antithesis of an exponent. 

The following are some general rules used for radicals.

• The resultant will be positive if there is a positive number under the radical.

• The resultant will be negative if the number under the radical is negative. Take note radical negative numbers are only calculated if their index is odd.

• If the index of the radical is not mentioned, then it is considered a square root.

• Multiplication of numbers applies to numbers that share the same radical and index. For example, 5√21 × 5√15 =  5√(21×15) =  5√315.

• Similarly, the division is also applicable to numbers that have the same radical. For example, ³√25/³√5 = ³√(25/5) = ³√5.

• The reverse of the multiplication can be applied by splitting the number under the same radical. For example, √32 = √16 × √2 = 4√2.

• In any equation, a radical can be expressed in its exponential form.

• An index number’s inverse exponent is equivalent to the radical itself.

ⁿ√(x) is a radical expression of the “nth root of x”. A radical expression is said to be simplified, it has to be radically free. So, for making the given expression radical free, we need to power both sides of the given equation with “n”. 

ⁿ√(x) = p

(x)^1/n = p

(x^1/n)ⁿ = (p)ⁿ

x = (p)ⁿ

where,

• x is Radicand
• n is Index of Radical
• (ⁿ√) is Radical Symbol or nth root

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Problem 1: Solve the radical, √y = 11, using the radical formula.

Solution:

Given,

√y = 11

To make the given expression radical-free, use the radical formula.

(y)^1/2 = 11

Now squaring on both sides we get

⇒ [(y)^1/2]² = (11)²

⇒ y = (11)² ⇒ y = 121

Hence, the value of y is 121.

Problem 2: Solve the radical expression (7 + 5√a)/b, where a = 36 and b = 4.

Solution:

Given,

a = 36 and b = 4

By substituting the values of a and b in the given radical expression we get

(7 + 5√a)/b

= (7 + 5√36)/4

= (7 + 5 × 6)/4

= 37/4 = 9.25

Hence, the value of the given radical expression is 9.25.

Problem 3: Simplify √(175a⁴b⁵)/√(7b).

Solution: 

√(175a⁴b⁵)/√(7b)

By using the quotient rule, we get

=[Tex] \sqrt{\frac{175a^{4}b^{5}}{7b}} [/Tex]

= √(25a⁴b⁴)

= 5a²b²

Hence, the value of the given radical expression is 5a²b².

Problem 4: Solve √(3x+9) − 6 = 0

Solution:

Given,

√(3x+9) − 6 = 0

⇒ √(3x+9) = 6

Now squaring on both sides we get

⇒ (3x + 9) = (6)²

⇒ 3x + 9 = 36

⇒ 3x = 36 – 9 = 27

⇒ x = 27/3 = 9

Hence, the value of x is 9.

Problem 5: Simplify ³√36a⁵b² ³√6ab.

Solution:

Given,

³√36a⁵b² ³√6ab

= ³√(36a5b2) × (6ab)

=  ³√(216a⁶b³)

= ³√(6³a⁶b³)

= 6a²b

Hence, the value of the given radical expression is 6a²b.

Problem 6: Find the value of 3/(2+√5).

Solution:

Given, 

Now, multiply and divide the given term with (2 – √5)

= 3/(2 + √5) × (2 – √5)/(2- √5)

= 3(2 – √5)/(2²– 5)     {Since, (a + b)(a – b) = a² – b²}

= 3(2 – √5)/(4 – 5)

= 3(2 -√5)/(-1)

= 3(√5 – 2)

Hence, 3/(2 + √5) = 3(√5 – 2).

What is the Meaning of Radical in Math?

Radical is mathematics are defined as the symbol ‘√’ used in identifying the nth root of a number i.e. square root, cube root, etc.

What is Exponent and Radical?

Exponent defines how many times we are multiplying a number by itself. Wherea radicals used to express the root of any number.

What is the Radical Equation?

Any equation in which the variable is under radical is called the radical equation.

What is the General Formula for a Radical?

Radical expression is in general form are expressed as, ⁿ√ x. Where, ‘x’ is the radicand, and and ‘n‘ is known as the index of ⁿ√ x.

How do you Solve a Radical?

Radicals can be easily solved, by Isolating one of the radical terms on one side of the equation and raise both sides of the equation to the power of the index and then simplifying accordingly.