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16x^{2}+39x+30
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16x^{2}+39x+30
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16x^{2}+40x+25-x+5
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-4x-5\right)^{2}.
16x^{2}+39x+25+5
Combine 40x and -x to get 39x.
16x^{2}+39x+30
Add 25 and 5 to get 30.
16x^{2}+40x+25-x+5
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-4x-5\right)^{2}.
16x^{2}+39x+25+5
Combine 40x and -x to get 39x.
16x^{2}+39x+30
Add 25 and 5 to get 30.
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