Question

what are the roots of this equation, please show all working.

r^2 + r - 2 =0

Answer 1

b^2 - 4ac = 1 - 4*1*(-2) = 9

Answer 2

or factoring r^2 + r - 2 = (r + 2)*(r - 1)

Answer 3

-> r = -2 or r = 1

Answer 4

thankyou very much i was after the factoring answer