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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Updated on: 10-Oct-2022

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