Divide.

40a² ÷ (–10a)

The division is as follows:

Here when -10a is multiplied by -4a we get 40a² as the result.

Here the divisor is negative so the quotient has to be negative to get remainder zero.

In division the sign of the product [divisor × quotient] is always inverted to get the final result.

So the sign of product should always be opposite to that of the dividend.

So 40a² becomes perfectly divisible by -10a and hence the quotient is -4a and remainder is 0.