Question

Find k; -5 is zero of 3x2 +8x - k

Answer 1

5328765inches that this guy

Answer 2

p(x) = 3x^2 + 8x - k
p(-5) = 3(-5)^2 + 8(-5) -k
0 = 3(25) - 15 -k
0 = 75 -15 -k
0 = 60 - k
-60 = -k
k = 60

Hope it helps!