I can- I.D/ graph quadratic functions in the form on y=ax²+ bx+c *All quadratic functions have a domain of 0 Zero of a Function- the value (x,y) at which function crosses the x-axis EX1 y=(x+2) (x-2) 0= (x+2) (x-2) (x+2)=0 (x-2)=0 x=-2 x=2 (-2,0) (2,0) (evil)Axis of symmetry- vertical line that divides the parabola in half (always passes threw the vertex) x= -b/29 *Axis of symmetry tells middle x value to graph* y= 2x²+16x-9 y= ax²+bx+c- get it in this form x= -16/2(2)= -16/4= -4
Significant points are: vertex (min/max) y-intercept x-inercept y=ax²+bx+c y=x²-4 x=-b/2a x= -(0)/ 2(1)=0 y=(0)²-4 y=-4 Step1- vertex: find the axis of symmetry to get the x-term & substitute back into the function for y Step 2- x-intercept: sub in 0 for y then factor your quadratic! solve each factored term Step 3- y-intercept: sub in 0 for x (your c value)
9-2 quadratic functions
9-3 Graphing Quadratic Functions
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