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This is a quadratic expression in x. It cannot be solved because it is an expression: there is no equation to solve. Furthermore, the discriminant for the quadratic = (-10)2 - 4*3*(-5) = 100+60 = 160 which is not a square number. There are, therefore no rational factors.

While it would be possible to give irrational factors, factorising a quadratic into linear terms containing irrational numbers is rarely useful.

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Q: How do you work out 3x squared -10x equals -5?
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