If it isn't already, get your equation into the form ax 2 + bx + c, then plug a, b, and c into the formula x = (-b +/- SqRt(b 2 - 4ac))/2a. X Research source If you can't easily solve for your x intercepts or factor your equation, use a special equation called the quadratic formula designed for this very purpose. In this case, your only x intercept is -1 because setting x equal to -1 will make either of the factored terms in parentheses equal 0.In this case, your x intercepts are the values for x which make either term in parentheses = 0. ![]() Some equations in the ax 2 + bx + c form can be easily factored into the form (dx + e)(fx +g), where dx × fx = ax 2, (dx × g + fx × e) = bx, and e × g = c. x = 11 and 13 are the parabola's x-intercepts. This method may work for simple quadratic equations, especially in vertex form, but will prove exceedingly difficult for more complicated ones.
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