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OpenStudy (anonymous):
Help! -7a^2 (3a^3 - 4a^5)
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OpenStudy (cggurumanjunath):
-21a^5+28a^7
OpenStudy (cggurumanjunath):
-7a^2*3*a^3 =-7*3*a^(2+3)
OpenStudy (cggurumanjunath):
-7a^2(-4a^5)=-7*4*a^(2+5)
OpenStudy (cggurumanjunath):
add the two ! we get the first (final) answer
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