Question

use formula to evaluate the following .4(a + b)2 – 20(a + b) + 25, when a = 2, b = 1
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Answer 1

=4(a+b)^2-20(a+b)+25
=4(a^2 +2ab + b^2) - 20(a+b) +25
= 4 ( 4+ 4 + 1) - 20(2+1) + 25
= 36 - 60 +25
= 1



Here is the complete solution..

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