factorise by using factor theorem 2 x cube -3 x square - 17 X + 30
expand using identity (3x - 2 Y + Z )whole square
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find out factor of 30 and then do hit and trial method
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=2x³-4x²+x²-2x-15x+30
=2x²(x-2)+x(x-2)-15(x-2)
=(2x²+x-15)(x-2)
=(2x²+6x-5x-15)(x-2)
=2x(x+3)-5(x+3) (x-2)
=(x+3) (2x-5) (x-2)
=2x²(x-2)+x(x-2)-15(x-2)
=(2x²+x-15)(x-2)
=(2x²+6x-5x-15)(x-2)
=2x(x+3)-5(x+3) (x-2)
=(x+3) (2x-5) (x-2)
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