Question

for what value of k, id-2 a zero of the polynomial 3x^2+5x+2k?

Answer 1

the answer of this sum is -11

Answer 2

Hi there !

p(x) = 3x² + 5x + 2k

p(-2) = 3 × [-2]² + 5 × -2 + 2k

3 × 4 -10 + 2k = 0
12-10 +2k = 0
2 + 2 k = 0
2k = -2
k = -2/2 
  = -1