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49-a^{2}
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49-a^{2}
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7\left(-a\right)+49+a\left(-a\right)+7a
Apply the distributive property by multiplying each term of 7+a by each term of -a+7.
-7a+49+a\left(-1\right)a+7a
Multiply 7 and -1 to get -7.
-7a+49+a^{2}\left(-1\right)+7a
Multiply a and a to get a^{2}.
49+a^{2}\left(-1\right)
Combine -7a and 7a to get 0.
7\left(-a\right)+49+a\left(-a\right)+7a
Apply the distributive property by multiplying each term of 7+a by each term of -a+7.
-7a+49+a\left(-1\right)a+7a
Multiply 7 and -1 to get -7.
-7a+49+a^{2}\left(-1\right)+7a
Multiply a and a to get a^{2}.
49+a^{2}\left(-1\right)
Combine -7a and 7a to get 0.
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