Question

помогите пожалуйста алгебра 8 класс
(x-2)2+(x-1)(x+1)

Answer 1

$\boxed{ {(a - b)}^{2} = {a}^{2} - 2ab + {b}^{2} }$

$\boxed{ {a}^{2} - {b}^{2} = (a - b)(a + b)}$

${(x - 2)}^{2} + (x - 1)(x + 1) = ({x}^{2} - 2 \times x \times 2 + {2}^{2} ) + ( {x}^{2} - {1}^{2} ) = {x}^{2} - 4x + 4 + {x}^{2} - 1 = {x}^{2} + {x}^{2} + 4 - 1 - 4x = \boldsymbol{2 {x}^{2} + 3 - 4x}$