Question

(-5x^4)(-7x^3)
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Answer 1

$( - 5 {x}^{4} )( - 7 {x}^{3} ) = \\ \\ ( - 5 \times - 7) {x}^{4 } {x}^{3} \\ \\ \\ 35 {x}^{4} {x}^{3} \\ \\ 35 {x}^{4 + 3} \\ \\ \bf 35 {x}^{7}$