Question

Factorise the numerator and simplifyy^2-y-42 by y+7

Answer 1

using remainder theorem
$y + 7 = 0 \\ y = - 7$
$p \: at \: y = {y}^{2} - y - 42 \\ = { - 7}^{2} - ( - 7) - 42 \\ = 49 + 7 - 42 \\ = 56 - 42 \\ = 14$