19-05-2017
Mathematics

contestada

What is the product of polynomials (2a - 7 + a2) and (5 - a) ?

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19-05-2017

If I am correct, the answer should be 14a

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19-05-2017

2a-7+a2 (5-a)
multiply 5 to all terms 2a,-7,a2
And -a to 2a,-7,a2
2a (5)-7 (5)+a2 (5)+2a (-a)-7 (-a)+a2 (-a)
simplify
10a-35+5a2-2a2+7a-a3
rearrange and simplify
-a3+5a2-2a2+10a+7a-35
-a3+3a2+17a-35

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