Предмет: Алгебра, автор: Ivan0072007

Знайдіть значення виразу (x — 4)2 + 2(4 + х)(4 — x) + (х+4)2
при х = -1,2.

Ответы

Автор ответа: sstavridka

4

Ответ:

${(x - 4)}^{2} + 2(4 + x)(4 - x) + {(x + 4)}^{2} = {x}^{2} - 8x + 16 + 32 - 2 {x}^{2} + {x}^{2} + 8x + 16 = 64 \\ \\ {( - 1.2 + 4)}^{2} + 2(4 + 1.2)(4 - 1.2) + {( - 1.2 - 4)}^{2} \\ { - 5.2}^{2} + 2 \times 5.2 \times 2.8 + {2.8}^{2} = 27.04 + 29.12 + 7.84 = 64$

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