(c) 3x yz (7x2 + 2y + 2 + 4w)
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3x²yz (7x² + 2y + z+ 4w)
= 3x²yz (7x² )+ 3x²yz(2y )+3x²yz( z)+ 3x²yz(4w)
= 21x⁴yz + 6x²y²z+3x²yz²+12wx²yz
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