Question

If one root of quadratic equation 2x2+ax+6=0 is 2 then a= ?
(a) 7 (b) -7 (c) 7/2 (d) -7/2

Answer 1

Answer:

b

Step-by-step explanation:

put the p(x)=2x²+ax+6=0

p(2)=2(2²)+2a+6=0

8+2a+6=0

2a= -14

a=-14/2

a=-7