Question

If x + 2 is a factor of x square + 5x + a, then the value of a is
(1) 6
(2) 7
(3) 5
(4) 3​ please give a step by step solution​

Answer 1

Step-by-step explanation:

f(x) = x3 -2a x2 -5x +6a

if (x+2) is a factor, then f(-2) = 0

f(-2) = -8 -2a (-2)2 -5(-2) + 6a = 2 - 2a = 0

hence a = 1

Answer 2

Answer:

answer is a.6

Step-by-step explanation:

see X2+5x+a

and x=-2

therefore, -2x-2+5x(-2)+a=0

4-10+a=0

-6+a=0

a=0+6

therefore,a=6