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48k^{2}+56k+16
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48k^{2}+56k+16
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16+56k+49k^{2}-k^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4+7k\right)^{2}.
16+56k+48k^{2}
Combine 49k^{2} and -k^{2} to get 48k^{2}.
16+56k+49k^{2}-k^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4+7k\right)^{2}.
16+56k+48k^{2}
Combine 49k^{2} and -k^{2} to get 48k^{2}.
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