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Anonymous
2X2+5x-12
4+5x-12
-8+5x
5x-8
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2x2+13x+15 = (2x+3)(x+5)
4x4 + 1 = (2x2 - 2x + 1)(2x2 + 2x + 1)
(2x + 1)(x + 3)
(2x+4)(x+1)
The expression cannot be factorised.