Question

$-left(-cb^{7}
ight)^{3}$
use the optional scratchpad.

Explanation:

Step1: Apply power to each term

$$(-cb^7)^3 = (-1)^3 \cdot c^3 \cdot (b^7)^3$$

Step2: Calculate each component

$$(-1)^3=-1,\ (b^7)^3=b^{7 \times 3}=b^{21}$$
So $(-cb^7)^3 = -c^3b^{21}$

Step3: Apply the outer negative sign

$$-(-c^3b^{21}) = c^3b^{21}$$

Answer:

$c^3b^{21}$