Question

Simplify the expressions 3y (2y-7)-3(y - 4) - 63 and evaluate for y = -2

Answer 1

$3y (2y-7)-3(y - 4) - 63 \:and \: evaluate for \: y = -2 \\ 6 {y}^{2} - 21y - 3y + 12 - 63 \\ y = 2 \\6(2)^{2}-21(2) - 3(2) + 12 - 63 \\ 6(4) - 42 - 6 + 12 - 63 \\ 24- 42 - 6 + 12 - 63 \\ 36 - 111 \\ - 75 \: \: answer...$