math
posted by carol .
(4a^3  7a^2)  (8a^3 + 1a^2) Subtract
= 4a^3  7a^28a^3  1a^3
= 4a^3  8a^3  7a^2  1a^2
= (48)a^3  (7  1)a^2
= 4a^3  8a^2
Is this correct?

Except for the typo in the second line, it looks correct.
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