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Evaluate the following expression when $a=3$ and $b=-8: 3 a^{2}-7 b$
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With this question they have given you a formula with 2 variables, they have also given you the value of the 2 variables so all that needs to be done is substitution

thus:

find: 3a2 - 7b

a = 3

b = -8

answer = 3 * (3)2 - 7*(-8)

answer = 3*9 + 56 (remember 2 negatives cancel out and give you a positive so)

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