Question #277ac

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Answer 1 · 2017-04-07T16:03:44

$= x^{2} - 4$ $=x^2-4$

Foil $(x - 2) (x + 2)$ $(x-2)(x+2)$ ,

$= x^{2} + 2 x - 2 x - 4$ $=x^2+2x-2x-4$

Collect like terms,

$= x^{2} - 4$ $=x^2-4$

Answer 2 · 2017-04-07T16:44:29

Last term is $- 4$ $-4$

The "Last" term in the the product will be the product of the two last terms in each bracket.

It is not necessary to find the whole product.

$(x - 2) (x + 2)$ $(x-color(red)(2))(x+color(red)2)$

$- 2 \times + 2 = - 4$ $color(red)(-2 xx+2) = -4$