Question

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Evaluate the following expression using the values given:

Find -3a2 - b3 + 3c2 - 2b3 if a = 2, b = -1, and c = 3.

Numerical Answers Expected!

Answer 1

So you can see better

Answer 2

expression is
\[-3a ^{2}-b ^{3}+3c ^{2} -2b ^{3}\]
simplify the expression (notice that the term of variable b combines)
\[-3a ^{2}-3b ^{3}+3c ^{2}\]
a factor of 3 can be taken out common to simplify the calculations
\[3(-a ^{2}-b ^{3}+c ^{2)}\]
put in the values
\[3(-(2)^{2}-((-1)^{3})+(3)^{2})\]
\[3(-4-(-1)+9)\]
\[3(-4+1+9)\]
\[3(6)\]
\[18\]