Question

Дано m(-5; y); |m|=13, знайди y

Answer 1

Ответ:

|m| =

$\sqrt{( { - 5)}^{2} + {y}^{2} } = 13 \\ ( - {5}^{2} ) + {y}^{2} = 169 \\ 25 + {y}^{2} = 169 \\ {y}^{2} = 144 \\ (y - 12)(y + 12) = 0 \\ y = 12 \\ y = - 12$