7. Evaluate (2.2a5b2)(3.3a²b2) when a=1, b =-1.
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Step-by-step explanation:
( 2.2a.5b.2)(3.3a^.b^)
= {2 X 2 X 1 X 5 X (-1) X 2} { 3 X 3 X (1)^ X (-1)^}
= ( - 40) X 9
= - 360
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