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Evaluate the expression given below for a = $-$4:
7a2 $+$ 7a $-$ 20
Given: 7a2 $+$ 7a $-$ 20
To find: Here we have to find the value of the given expression 7a2 $+$ 7a $-$ 20 when a is equal to $-$4.
Solution:
7a2 $+$ 7a $-$ 20
Putting the value of a = $-$4;
= 7($-$4)2 $+$ 7($-$4) $-$ 20
= 7(16) $-$ 28 $-$ 20
= 112 $-$ 48
= 160
So, value of the given expression 7a2 $+$ 7a $-$ 20 when a is equal to $-$4 is 160.
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