0
Substitute 0 as x to get the y-intercept.
To get the intersections on the x-axis you need to factorise and then the x values that make each bracket zero is the value.
E.g.
x2 + 10x + 7 = 0
(x + 5)(x + 2) = 0
x1 = -5 , x2 = -2
So the y-intercept is 7, and the x-intercepts are at x=-5 and x=-2
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Why does y equals 0 when solving a quadratic equation?
Because when your solving a quadratic equation your looking for x-intercepts which is where why equals 0 and x equals what ever the answer is.
What are the x-intercepts of the graph of y equals 12x2 - 5x - 2?
Using the quadratic equation formula: x = -1/4 and x = 2/3
How do you solve a quadratic equation graphically?
The roots of the quadratic equation are the x-intercepts of the curve.
Why do you need x intercepts for quadratic equations?
so you can find the solution for the x-values. the x-intercepts are when the graph crosses the x-axis
Find the x-intercepts for the parabola defined as y equals -9 x to the second power-6x plus 9 answer as two ordered pairs?
The x intercepts are when y=0. Substitute the zero in for all y and then solve. Use quadratic formula and reduce. I got (-1+/- sqrt 10)3 about .72075922 and -1.387425887
