Question

Factorise the following(middle term splitting) i)6x^2+7x-3 ii)84-2r-2r^2

Answer 1

i) 6x²+7x-3
   6x²+9x-2x-3
   3x(2x+3)-1(2x-3)
   (3x-1)(2x-3)

ii) 84-2r-2r²                   In standardized form
                                      2r²+2r-84
2r²+14r-12r-84
2r(r+7)-12(r+7)
(2r-12)(r+7)