Question

Is 18 no. ans is 10a-ab-4a-6b and 19 no.ans 6a2b -9 ab2 are these answer correct or not

Answer 1

Answer:

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Answer 2

18 is not correct but 19 is correct .18 ans is 16a-2b^2-ab-6b .

$= 10a - (ab + b ^{2} - 6a + 6b- b {}^{2} ) \\ = 10a - ab - b ^{2} + 6a - 6b + b ^{2} \\ = 16a - ab - 6b$