SOLUTION: I have a test tomorrow and these questions will be dominant on the test (12x to the exponent of 3 + 15x to the exponenet of 3)(+4x +5) I know the answer

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I have a test tomorrow and these questions will be dominant on the test (12x to the exponent of 3 + 15x to the exponenet of 3)(+4x +5) I know the answer       Log On


   



Question 38392: I have a test tomorrow and these questions will be dominant on the test
(12x to the exponent of 3 + 15x to the exponenet of 3)(+4x +5)
I know the answer because my teacher gave it to me but I dont know how to get the answer. Is there anyway you can walk me through the steps?

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
If what you mean is
(12x^3 + 15x^3)(4x + 5), you can add the first two terms together before multiplying, and get
27x^3(4x + 5) =
108x^4 + 135x^3
Remember that when you multiply like bases, you add the exponents...