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361x^{2}-956x+881
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361x^{2}-956x+881
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36x^{2}+84x+49+\left(5x-8\right)^{2}\times 13
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(6x+7\right)^{2}.
36x^{2}+84x+49+\left(25x^{2}-80x+64\right)\times 13
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-8\right)^{2}.
36x^{2}+84x+49+325x^{2}-1040x+832
Use the distributive property to multiply 25x^{2}-80x+64 by 13.
361x^{2}+84x+49-1040x+832
Combine 36x^{2} and 325x^{2} to get 361x^{2}.
361x^{2}-956x+49+832
Combine 84x and -1040x to get -956x.
361x^{2}-956x+881
Add 49 and 832 to get 881.
36x^{2}+84x+49+\left(5x-8\right)^{2}\times 13
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(6x+7\right)^{2}.
36x^{2}+84x+49+\left(25x^{2}-80x+64\right)\times 13
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-8\right)^{2}.
36x^{2}+84x+49+325x^{2}-1040x+832
Use the distributive property to multiply 25x^{2}-80x+64 by 13.
361x^{2}+84x+49-1040x+832
Combine 36x^{2} and 325x^{2} to get 361x^{2}.
361x^{2}-956x+49+832
Combine 84x and -1040x to get -956x.
361x^{2}-956x+881
Add 49 and 832 to get 881.
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