Factorise: 1/5 x^2 +2x-15
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1/5 x^2 +2x-15
1x^2/5 +2x -15
x^2/5 +2x-15
multiply by 5
x^2 +10x -75
x^2 +15x -5x -75
x(x+15) - 5(x+15)
(x+15) (x-5)
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