Question

Помогите!!! даю 15 балов

Answer 1

Объяснение:

$1)f(2) = 3 \times 2 + 5 = 6 + 5 = 11 \\ f( - 4) = 3 \times ( - 4) + 5 = - 12 + 5 = \\ = - 7$

$2)f(x) = 20 \\ 3x + 5 = 20 \\ 3x = 15 \\ x = 5 \\ \\ f(x) = - 16 \\ 3x + 5 = - 16 \\ 3x = - 21 \\ x = - 7$

$3)f( - 2) = 3 \times ( - 2) + 5 = - 6 + 5 = - 1 \\ - 1 = - 1 \\ f(7) = 3 \times 7 + 5 = 21 + 5 = 26 \\ 26 ≠16$