Question

simplify (3y + 5x) (x-1) - (y-2x) (x+4​

Answer 1

$(5x + 3y)(x - 1) -( y - 2x)(x + 4) \\ = 5 {x}^{2} + 3xy - 5x - 3y - (xy + 4y - 2 {x}^{2} - 8x) \\ = 5 {x}^{2} + 3xy - 5x - 3y - xy - 4y + 2 {x}^{2} + 8x) \\ = 7 {x}^{2} + 2xy + 3x - 7y$

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