To raise a term with an exponent to another exponent, retain the base and multiply the exponents:

The greatest common factor (GCF) is the greatest factor that divides two integers.

A factor is a positive integer that divides evenly into a given number. For example, the factors of 8 are 1, 2, 4, and 8.

Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):

4 + (5 + 5) ÷ 5 x 2 - 2²
P: 4 + (10) ÷ 5 x 2 - 2²
E: 4 + 10 ÷ 5 x 2 - 4
MD: 4 + \( \frac{10}{5} \) x 2 - 4
MD: 4 + \( \frac{20}{5} \) - 4
AS: \( \frac{20}{5} \) + \( \frac{20}{5} \) - 4
AS: \( \frac{40}{5} \) - 4
AS: \( \frac{40 - 20}{5} \)
\( \frac{20}{5} \)
4

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so add the coefficients and retain the base and exponent:

-3x⁴ + 5x⁴
(-3 + 5)x⁴
2x⁴