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International Electronics and Technology Forum
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URGENT ALGEBRA HELP.?
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Topic: URGENT ALGEBRA HELP.? (Read 494 times)
Soccer_Luffer
Newbie
Posts: 1
URGENT ALGEBRA HELP.?
«
on:
August 07, 2011, 02:19:21 AM »
Using graphing technology, create your own quadratic equation whose graph opens down and crosses the x-axis at two points. Use complete sentences to explain what piece of the quadratic equation causes its graph to open up or down. Approximate the coordinates of the vertex and x-intercepts of the parabola.
I dont need the complete sentences but i need an equation. idk how to do this ): . thanks so mucch (:
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Ann
Newbie
Posts: 7
Re: URGENT ALGEBRA HELP.?
«
Reply #1 on:
August 07, 2011, 01:09:12 PM »
Two times the graph should cross the x-axis = two solution for the quadratic equation.
(x +a) (x +b) = 0
Arbitrarily, I'll pick a= 5, b=8.
(x+5) (x+8) = 0
The solutions are x=-5, x=-8.
(x+5) (x+8)=
x^2 +8x +5x + 40 =
x^2 + 13x +40
y-intercept is when x = 0.
0^2+13*0 + 40 =
40
y-intercept=40
It opens up because the coefficient on x^2 is positive.
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