Question

помогите решить пжпжпжпжжжпжпжпжжжпж​

Answer 1

Ответ:

${(4 + a)}^{2} = (a + 2)(a - 2) \\ 16 + 8a + {a}^{2} = {a}^{2} - 4 \\ 8a + {a}^{2} - {a}^{2} = - 4 - 16 \\ 8a = - 20 \\ a = - \frac{20}{8} \\ a = - 2.5$