Question

Factorise using factor theorem:

1) 2x³ + 7x² – 9

2) 4z³ + 23z² – 41x – 42

Answer 1

1 2X३+7x२-9
=2x३+9x-2x-9
=x२(2x+9)-1(2x+9)
=(x२-1)(2x+9)
=x=1 or x=-9\2