Question

If one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is (a) 10 (b) -10 (c) 5 (d) -5

Answer 1

Answer: b) -10

Step-by-step explanation:

Since 2 is a zero of the polynomial p(x)=x²+3x+k,

p(2)=0

2²+3*2+k=0

k=-4-6

=-10

Answer 2

x^2 + 3x + k=0

2^2 + 3(2) + k=0

4 +6 +k = 0

10 = -k

k = -5