1.

Use suitable identities to find the following (2x+5) (2x-7)

Answer»

-step explanation:IDENTITY USED=(x+a) (x+b) =x^2+(a+b)x+2ab here; x=2x,a=5,b=(-7)so, 2x × 2x + {5+(-7)}2x +2×5×(-7) 4x^2+(-2)2x+(-70) 4x^2+(-4x) - 70 4x^2 -4x -70



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