Question

If 2 is a root of the equation x2 + ax + 12 =0 than find a
(a) -8
(b) -4
(C) -2
(d) o
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Answer 1

Answer:

-8

Step-by-step explanation:

If 2 is a root of the equation then after substituting 2 in place of x in the equation we get-

2^2+a*2+12=0

4+12+2a=0

16+2a=0

2a=-16

a=-16/2

a=-8

Therefore the answer to the question is -8.

Answer 2

Answer:

(a) -8

Step-by-step explanation:

x^2 + ax + 12 = 0

(2)^2 + a(2) + 12 = 0

4 + 2a+ 12 = 0

16 + 2a = 0

2a = -16

a = -16/2

a = -8

Therefore , option a is the right answer.