hi lol, i totally forgot my grd 9 stuff, how do u find x-intercept again!? with a quadratic formula like this y=-3x^2 +5x +4? do u just factor it and get the root? what do u do!! thanks

2. Originally Posted by lickman
hi lol, i totally forgot my grd 9 stuff, how do u find x-intercept again!? with a quadratic formula like this y=-3x^2 +5x +4? do u just factor it and get the root? what do u do!! thanks
yes, you set y = 0 and solve for x. you can solve for x in many ways, by factorizing, the quadratic formula or completing the square.

you cannot factorize here, so use the quadratic formula. it is easier than completing the square