![\displaystyle [x + 3][x + 4]](/tpl/images/2712/2324/a6373.png)
![\displaystyle x^2 + 7x + 12 \\ \\ \boxed{[x + 3][x + 4]}](/tpl/images/2712/2324/b2ddc.png)
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Factorise : x² + 3x + 4x + 12...
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