Question

( 4m+ 7n ) ( 16m²-28mn + 47n²) :​

Answer 1

( 4m+ 7n ) ( 16m²-28mn + 47n²) = $4m\cdot \:16m^2+4m\left(-28mn\right)+4m\cdot \:47n^2+7n\cdot \:16m^2+7n\left(-28mn\right)+7n\cdot \:47n^2$ = $4\cdot \:16m^2m-4\cdot \:28mmn+4\cdot \:47mn^2+7\cdot \:16m^2n-7\cdot \:28mnn+7\cdot \:47n^2n$ = $64m^3-8mn^2+329n^3$.