Question

Упростить выражение:

1. (a-2)^2

2. (a-3)(a-3)

3. (x-1)(x^2+x-1)

Answer 1

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

Answer 2

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