(x + 6y)(x - 3y)
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x2 = 18y2/5 + 10 Or if you want to isolate x: x = ± √(18y2/5 + 10)
x3+27y3 = (x+3y) · (x2-3xy+9y2)
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 + 10x + 21 = (x + 3)(x + 7)
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