Evaluate
\left(x+3\right)\left(x^{2}+4\right)
Expand
x^{3}+3x^{2}+4x+12
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2x^{2}+4x+12+\left(x+1\right)x^{2}
Add 5 and 7 to get 12.
2x^{2}+4x+12+x^{3}+x^{2}
Use the distributive property to multiply x+1 by x^{2}.
3x^{2}+4x+12+x^{3}
Combine 2x^{2} and x^{2} to get 3x^{2}.
2x^{2}+4x+12+\left(x+1\right)x^{2}
Add 5 and 7 to get 12.
2x^{2}+4x+12+x^{3}+x^{2}
Use the distributive property to multiply x+1 by x^{2}.
3x^{2}+4x+12+x^{3}
Combine 2x^{2} and x^{2} to get 3x^{2}.
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