Question

for what value of p,2 is a zero of the polynomial x²-2x-(2p+8)

Answer 1

sub. 2 in polynomial
$2^2-2(2)-2p-8=0 \\ 4-4-2p-8=0 \\ p=-4$
so p=-4

Answer 2

2²-2×2-(2×p+8) ⇒4-4-(2p+8)⇒2p+8
p⇒-4