Factorise 84-2x-x^2

1.	Factorise 84-2x-x^2
Answer» {tex}\\style{font-size:10px}{\\begin{array}{l}84-2x-2x^2\\\\=-2(x^2+x-42)\\\\=-2(x^2+7x-6x-42)\\\\=-2\\{x(x+7)-6(x+7)\\}\\\\=-2(x+7)(x-6)\\end{array}}{/tex}

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