factorise xsquare+3root3-30 by splitting the middle term
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x^2+3√3x-30
=x^2+5√3x-2√3x-30
=x(x+5√3)- 2√3(x+5√3)
(x- 2√3)(x+5√3)
=x^2+5√3x-2√3x-30
=x(x+5√3)- 2√3(x+5√3)
(x- 2√3)(x+5√3)
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