Use the suitable identities to find the product of $(x - 2) (x + 2)$

x - 4

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x^{2} - 4

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x^{2} - 4 x

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x^{2}

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Solution

The correct option is B $x^{2} - 4$
$(x - 2) (x + 2)$
We can use $(x + a) (x + b) = x^{2} + (a + b) x + a b$ identity,
So, $a = - 2, b = 2$
$=$ $x^{2} + (- 2 + 2) x + (- 2) (2)$
$=$ $x^{2} + 0 x - 4$
$=$ $x^{2} - 4$

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Use a suitable identity to get each of the following products:
$(\frac{x}{2} + \frac{3 y}{4}) (\frac{x}{2} + \frac{3 y}{4})$

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