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x2-x-30 = (x-1/2)2 - 1/4 -30 as (a+b)2=a2+2ab+b2 with a=x then b=-1/2
= (x-1/2)2 - 121/4
= [(x-1/2)-sqrt(121/4)] [ [(x-1/2)+sqrt(121/4)] as a2-b2=(a-b)(a+b)
then = (x-1/2-11/2)(x-1/2+11/2) = (x-6)(x+5)
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