Polynomials, SMB-003 MC

If `x + a` is a factor of `8x^3-14x^2-a^2 x`, then the value of `a` is

7
4
1
–2

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`D`

Show Worked Solution

`f(-a)`	`= 8(-a)^3-14(-a)^2-a^2(-a)`
`0`	`= -8a^3-14a^2 + a^3`
`0`	`= -7a^3-14a^2`
`0`	`= -7a^2 (a + 2)`
`a`	`= -2`

`=>D`