How do you expand and Simplify this equation?

Mathematics
Tutor: None Selected Time limit: 1 Day

The equation is 2(3a+4)(a-6)-(3-a)^2+4(5-a) and apparently the answer is 5a^2-26a-37. How do you get to the answer??

Sep 28th, 2014

2(3a+4)(a-6)-(3-a)^2+4(5-a)

(6a+8)(a-6)-(9-6a+a2)+20-4a

6a2-36a+8a-48-9+6a-a2+20-4a

6a2-a2-36a+8a+6a-4a-48-9+20

5a2-26a-37


Sep 28th, 2014

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