Simplify: 5x^4 (4x+5)=

20x⁵ + 20x⁴

Step-by-step explanation:

Use distributive rule: a*(b +c) =a*b + a*c

5x⁴(4x + 5) = 5x⁴ * 4x + 5x⁴ * 5

                  = 20x⁵ + 20x⁴

Hint: 5x⁴ * 4x multiply the coefficient and then the variables. For multiplying variable, if they two have same base, then add the powers

5*4 * x⁴ * x = 20x⁵

which grade level is it in math? i can help if i know.

Step-by-step explanation: