$If the expression 4 x^{2} - 64 can be written as$
$a (x - b) (x + b), find the value of a - b .$

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Solution

The correct option is A 0
Given expression:
$4 x^{2} - 64 = 4 (x^{2} - 16) = 4 (x^{2} - 4^{2}) = 4 (x - 4) (x + 4)$

$Comparing 4 (x - 4) (x + 4) w i t h a (x - b) (x + b)$
we get a = 4 and b = 4.

$So, value of a - b is 4 - 4 = 0$

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