हल करना (20a ^ 2 - 3b ^ 2 + ab)(- 7b ^ 2) | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$(20a^{2}-3b^{2}+ab)\times(-7b^{2})$$