Question

(2x +5) (2x +7) is equal to

Answer 1

(2x+5)(2x+7)

2x(2x+7)+5(2x+7)

4x²+14x+10x+35

4x²+24x+35

Answer 2

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

(2x+5)(2x+7) = (2x)^2 + (5+7)2x + (5*7)
=> 4x^2 + 24x + 35 <= answer

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