D.
11. Simplify the expression, (a22 x a-12) x (b-10 x b20)
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(a22×a-12) × ( b-10×b20 )
a22 × a - 12 × b - 10 × b20
a × 22 × a - 12 × b - 10 × b × 20
a×a × 22-12-10×20 × b×b
a^2 × 22×20-12-10 × b^2
a^2 × 440 - 22 × b^2
a^2 × 418 × b^2 ans
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