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Question
Evaluate: - 4y (15 + 12y - 8z) (x - 2y)
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Solution
- 4y (15 + 12y - 8z) (x - 2y)
= - 4y (x - 2y)(15x + 12y - 8z)
= (- 4xy + 8y2)(15x + 12y - 8z)
= - 4xy (15x + 12y - 8z) + 8y2 (15x +12y - 8z)
= -60x2y - 48xy2 + 32xy + 120xy2 + 96y3 - 64y2z
= -60x2y - 48xy2 + 120xy2 - 64y2z + 96y3 + 32xy
= -60x2y + 72xy2 - 64y2z + 96y3 + 32xyz
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