Question

(3-х)², если х= -1, то чему равен пример?

Answer 1

1ый способ:
${(3 - x)}^{2} = 9 - 6x + {x}^{2} = 9 - 6 times ( - 1) + {( - 1)}^{2} = 9 + 6 + 1 = 16.$
2ой способ:
${(3 - x)}^{2} = {(3 - ( - 1))}^{2} = {(3 + 1)}^{2} = {4}^{2} = 16.$