Question

x^2-81 factorize it plz give answer
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Answer 1

Answer:

(x-81)(x+81)

Step-by-step explanation:

a^2-b^2=(a+b)(a-b)

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Answer 2

Step-by-step explanation:

Given:-

x^2-81

To find:-

Factorise x^2-81 ?

Solution:-

Given expression is x^2-81

81 can be written as 9^2

=> x^-81

=> x^2-9^2

It is in the form of a^2-b^2

Where a = x and b = 9

We know that

(a+b)(a-b)=a^2-b^2

=> x^2-9^2

=> (x+9)(x-9)

(or)

It can be written as

(x+9)[(√x)^2-(3)^2]

=>(x+9)(√x+3)(√x-3)

Answer:-

Factorization of x^2-81 is (x+9)(x-9) (or )

(x+9)(√x+3)(√x-3)

Used formula:-

• (a+b)(a-b)=a^2-b^2