Question

If x cube + 10 x square + a x + 7 is divisible by x + 7 then find a

Answer 1

Answer:

x³+10x²+ax+7

If the above equation is divisible by

(x+7), then (x+7) is a factor of the above equation, then as rule,...

x+7 = 0

x = -7

We can place this value of x in the equation.......

putting value of x,

x³+10x²+ax+7

(-7)³+10(-7)²+a(-7) +7 = 0

-343 + 490 -7a +7 = 0

-343 + 490 -a = 0

147 -a = 0

a = 147✔✔✔✔

Explanation:

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