Question

Divide 21a^3-14a by -7
A.-3a^3+2a
B.-3a^3-2a
C.-3a^2+2
D.3a^3+2a

Answer 1

The correct answer is A:-3a^3+2a

Answer 2

For this case we must find the quotient of
`21a^3-14a` between -7:

That is to say:

`\frac {21a ^ 3-14a} {- 7} =\\\frac {21a ^ 3} {- 7} + \frac {-14a} {- 7}`

We know that:

`\frac {21} {7} = 3\\\frac {14} {7} = 2\\\frac {+} {-} = -`

Finally:

`-3a ^ 3 + (2a) =\\-3a ^ 3 + 2a`

Answer:

`-3a ^ 3 + 2a`

Option A