SOLUTION: I don't understand substitutions Trying to resolve: 7(x+3) - 2x(x+5)

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Question 498243: I don't understand substitutions
Trying to resolve: 7(x+3) - 2x(x+5)
Answer by deborabr(181) About Me  (Show Source):
You can put this solution on YOUR website!
7(x+3) - 2x(x+5)
7x+21-2x^2-10x
-2x^2+7x-10x+21
-2x^2-3x+21 *(-1) to change the signal
2x^2+3x-21