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Question
Multiply -4xy3 and 6x2y and verify your result for x = 2 and y= 1.
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Solution
(−4xy3) × (6x2y) = (−4 × 6) (x x x2) (y3 x y)
= −24x3y4
For x = 2 and y = 1
(−4xy3) × (6x2y) = (−4 × 2 × 13) × (6 × 22 × 1)
= (−8) × 24 = −192
And, −24x3y4 = −24 × 23 × 14
= −24 × 8 × 1 = −192
∴ For x = 2 and y = 1, it is verified that
(−4xy3) × (6x2y) = −24x3y4
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