factorise 12x^2-15=11x
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when we factories
12x²-15=11×
12x²-11x-15 =0
12x²-20x-9x-15=0
4x(3x-5) -3 ( 3x - 5)
4x -3 =0 or 3x - 5 =0
4x = 3 3x= 5
x = 3/4 x = 5/3
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