Question #49a3a

2 Answers
Jan 29, 2018

55a2+24a16

Explanation:

If I understood you correctly you mean
(7a+a)2(4+3a)2
otherwise feel free to correct me.
1. Calculate 7a+a

7a+a=8a

  1. Square the brackets using the binomial formula

(a+b)2=a2+2ab+b2

(8a)2(3a4)2=82a2(32a2432a+42)

  1. Simplify

82a2(32a2432a+42)=64a29a2+24a16=55a2+24a16

Jan 29, 2018

2a2+7a+4

Explanation:

In the absence of any formatting, the meaning of the question is not clear. Here is another interpretation which I think is more likely because there is nothing to indicate that the given powers are for the whole expressions.

We have: second expression minus the first expression:

(7a+a2)(4+3a2)

=7a+a2+43a2 multiply out the bracket

=2a2+7a+4 simplify the like terms.