Evaluate
\left(x+4\right)\left(9x+16\right)
Expand
9x^{2}+52x+64
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\left(9x+16\right)\left(x+4\right)
Combine x and 8x to get 9x.
9x^{2}+36x+16x+64
Apply the distributive property by multiplying each term of 9x+16 by each term of x+4.
9x^{2}+52x+64
Combine 36x and 16x to get 52x.
\left(9x+16\right)\left(x+4\right)
Combine x and 8x to get 9x.
9x^{2}+36x+16x+64
Apply the distributive property by multiplying each term of 9x+16 by each term of x+4.
9x^{2}+52x+64
Combine 36x and 16x to get 52x.
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