Question

please answer this question

Answer 1

$1) = (2x - 1)(x + 5) \\ = 2x(x) + 2x(5) - x - 5 \\ = {2x}^{2} + 10x - x - 5 \\ = 2 { x}^{2} - 5x - 5$
$(7 - {x}^{2} )(2x + 4) \\ = 7(2x) + 7(4) - 2x( {x) }^{2} - 4 {x}^{2} \\ = 14x + 28 - {2x}^{3} - 4 {x}^{2} \\ = - 2 {x}^{3} - 4 {x}^{2} + 14x + 28$
$(x - 3y)(5x + y) \\ (x)5x + xy - 5x(3y) - 3 {y}^{2} \\ 5 {x}^{2} + xy - 15xy - 3 {y}^{2}$
$(m - 4n)( - m + 3n) \\ - {m}^{2} + 3mn + 4mn - 12 {n}^{2} \\ - {m}^{2} - 12 {n}^{2} + 7mn$

Answer 2

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