Question

$(6 {x}^{2} - 5 {x}^{3} ) - (2 {x}^{2} - 4x + 9 {x}^{2} )$
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Answer 1

$\bigstar \: \: \bf(6 {x}^{2} - 5 {x}^{3} ) - (2 {x}^{2} - 4x + 9 {x}^{2} ) \\ \\ \leadsto \: \: \tt{6x}^{2} - {5x}^{3} - {2x}^{2} + 4x - {9x}^{2} \\ \leadsto \: \: \tt{ {6x}^{2} - {5x}^{3} - {11x}^{2} + 4x } \\ \leadsto \: \: \boxed{ \red{ \tt{ { - 5x}^{3} - {5 x}^{2} + 4x}}}$