Q4. Expand
a. (a-1)(a-9)
b. (3m –y)³
c. (a + 1 /2 )³
d. (3d-6+f)²
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Answer:
no.b:- (3m-y)³=27m³-27m²y+9my²-y³ or 27m³-y³-9my (3m-y)
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are u from Stella Maris school
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