(1.5x-2.1y)(4x+10y) = 1.5x•4x+1.5x•10y-2.1y•4x-2.1y•10y = 6x²+15xy-8.4xy-21y² = 6x²+6.6xy-21y²
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(1.5x-2.1y)(4x+10y) = 1.5x•4x+1.5x•10y-2.1y•4x-2.1y•10y = 6x²+15xy-8.4xy-21y² = 6x²+6.6xy-21y²