1. (х+7)²-100с²= (х+7-10с)(х+7+10с).
2. (х+8)²-х(х+5)= х²+16х+64-х²-5х= 11х+64.
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Answers & Comments
1. (х+7)²-100с²= (х+7-10с)(х+7+10с).
2. (х+8)²-х(х+5)= х²+16х+64-х²-5х= 11х+64.