Question

find the product using suitable identities (2x-3)(2x+5)​

Answer 1

Answer:

Step-by-step explanation:

Use identity

(x + a)(x + b) = x2 + (a + b) x + ab

So answer is

(2x-3)(2x+5)= => ( 2x )² + 2x ( 3 - 5 ) - ( 3 ) ( 5 )

=> 4x² + 2x ( - 2 ) - 15

=> 4x² - 4x - 15

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Answer 2

Step-by-step explanation:

(x+a)(x+b)=x^2+x (a+b)+ab

(2x)^2+2x (-3+5)+(-3×5)

4x^2+4x-15 is the answer

my answer is same as the other one but the difference is the +sign in front of 4x