Question

multiply and combine like terms if necessary.

4a(5a-1)^2

Answer 1

Exponents first.\[\rm 4a \cdot (5a - 1)^2 = 4a \cdot{\Large (} (5a)^2 - 2(5a)(1) +(1)^2{\Large)} = 4a\cdot (25a^2 -10a+1) \]

Answer 2

Use the distributive property to continue. I hope you can do the rest. :)