Bonsoir,
[tex](5x-10x)+(9-7x^2)-(1+5x) =\\\\5x - 10x + 9 - 7x^2 - 1 - 5x = \\\\- 7x^2 + 5x - 10x - 5x + 9 - 1 = \\\\- 7x ^ 2 - 5x - 5x + 8 =\\\\\boxed{-7x^2-10x+8}[/tex]
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Bonsoir,
[tex](5x-10x)+(9-7x^2)-(1+5x) =\\\\5x - 10x + 9 - 7x^2 - 1 - 5x = \\\\- 7x^2 + 5x - 10x - 5x + 9 - 1 = \\\\- 7x ^ 2 - 5x - 5x + 8 =\\\\\boxed{-7x^2-10x+8}[/tex]