factorise the middle term x^2+3root3x-30
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x²+3√3x-30
⇒x²+5√3x-2√3x-30
⇒x(x+5√3)-2√3(x+5√3)
⇒(x-2√3)(x+5√3)
⇒x²+5√3x-2√3x-30
⇒x(x+5√3)-2√3(x+5√3)
⇒(x-2√3)(x+5√3)
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