factorise it please it is urgent
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Step-by-step explanation:
(6). = (28)+(-15)+(-13)
= 13-13
= 0
(7). factorision of 6x^3-5x^2-13x+12
=1x^1-13x+12
=12x+12
=x=-12/12
=x=-1
6x^3-5x^2-13x+12
=6×-1^3-5×-1^2-13×-1+12
=-6+5+13+12
=-1+13+12
=12+12
=24
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