Solve -a^{2}b+15a^{2}b+a^2b-85a^2b-131a^2b+39a^2b=

$$- a ^ { 2 } b + 15 a ^ { 2 } b + a ^ { 2 } b - 85 a ^ { 2 } b - 131 a ^ { 2 } b + 39 a ^ { 2 } b =$$

Evaluate

$$-162ba^{2}$$

Solution Steps

Combine 15a^{2}b and a^{2}b to get 16a^{2}b.

$$\left(-a^{2}\right)b+16a^{2}b-85a^{2}b-131a^{2}b+39a^{2}b$$

Combine 16a^{2}b and -85a^{2}b to get -69a^{2}b.

$$\left(-a^{2}\right)b-69a^{2}b-131a^{2}b+39a^{2}b$$

Combine -69a^{2}b and -131a^{2}b to get -200a^{2}b.

$$\left(-a^{2}\right)b-200a^{2}b+39a^{2}b$$

Combine -200a^{2}b and 39a^{2}b to get -161a^{2}b.

$$\left(-a^{2}\right)b-161a^{2}b$$

Combine -a^{2}b and -161a^{2}b to get -162a^{2}b.

$$-162a^{2}b$$

Differentiate w.r.t. a

$$-324ab$$