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1-4a-7a+28a^{2}
Apply the distributive property by multiplying each term of 1-7a by each term of 1-4a.
1-11a+28a^{2}
Combine -4a and -7a to get -11a.
1-4a-7a+28a^{2}
Apply the distributive property by multiplying each term of 1-7a by each term of 1-4a.
1-11a+28a^{2}
Combine -4a and -7a to get -11a.