Use suitable identity to find the product: (x+8)(x-10) - Vidyadip

Question

Use suitable identity to find the product: $(x+8)(x-10)$

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Answer

$(x+8)(x-10)$
$=(x+8)\{x+(-10)\}$
(Using Identity $\left.(x+a)(x+b)=x^2+(a+b) x+a b\right)$
$=x^2+\{8+(-10)\} x+(8)(-10)$
$=x^2-2 x-80$

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