Question

if x+3is one of the factors x^3+2x^2-ax-18,then à=___​

Answer 1

Answer:

The value of a is 9.

Step-by-step explanation:

It is provided that (x + 3) is a factor of the equation x³ +2x² -ax - 18 = 0.

Then x = -3 will satisfy the equation x³ +2x² -ax - 18 = 0.

Compute the value of a by substituting the value of x as -3:

$x^{3}+2x^{2}-ax-18=0\\(-3)^{3}+(2\times(-3)^{2})-(a\times-3)-18=0\\-27+18+3a-18=0\\3a=27\\a=9$

Thus, the value of a is 9.

Answer 2

Answer:

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