Question

Упростить выражение:

1. 2(c-2)(2+c)

2. (x^2+3)^2

3. (a-3)(a+6)

Answer 1

$1) \: \: 2(c - 2)(2 + c) = 2( {c}^{2} - {2}^{2} ) = 2( {c}^{2} - 4) = 2 {c}^{2} - 8$
$2) \: \: {( {x}^{2} + 3)}^{2} = {( {x}^{2} )}^{2} + 2 \times {x}^{2} \times 3 + {3}^{2} = {x}^{4} + 6 {x}^{2} + 9$
$3) \: \: (a - 3)(a + 6) = {a}^{2} - 3a + 6a - 18 = {a}^{2} + 3a - 18$