Question

Evaluate each of the following using

Identities

b.(2x+5)(2x-5)​

Answer 1

Identity used -

(a+b) (a-b) = a² - 2ab + b²

so....

(2x + 5) (2x - 5) =

=(2)² - 2 x 2x x 5 + (5)²

= 4 - 20x + 25

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Answer 2

Answer:

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

(2x)^2-5^2

4x^2-25