factorise 2x^2 - 17x - 30
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Splitting the middle term
2x^2 - 17x - 30
S= -17
P=2 x-30= -60
No's= -20, 3
2x^2 -20x + 3x - 30
2x{x-10}+ 3{x-10}
[2x=3] [x-10]
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