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#1 2007-08-12 20:35:29

mathsux
Member
Registered: 2007-08-06
Posts: 10

Graph of y = x^2 + 6x + 2

Okay,

I need a non-calculator method for this problem.

I can work out the Turning point and put it into TP form, but I have massive difficulty finding the X-intercepts.

TP Form: y = -(x-3)^2 + 11 ---> Turning Point = (3, 11)

Y Intercept ---> y = 2

I just need the X-Intercepts!

PLz help.

Thanx.

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#2 2007-08-12 21:08:54

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Graph of y = x^2 + 6x + 2

Set y = 0 and solve the quadratic equation.

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#3 2007-08-12 21:22:22

mathsux
Member
Registered: 2007-08-06
Posts: 10

Re: Graph of y = x^2 + 6x + 2

I think I've done something wrong...I must've. If I check using the calculator the graph of -x^2+6x+2=y is like the opposite of the graph of -(x-3)^2+11=y (inverse)

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#4 2007-08-12 21:28:03

mikau
Member
Registered: 2005-08-22
Posts: 1,504

Re: Graph of y = x^2 + 6x + 2

You mean upside down? thats definitly not the case. They both point down (lead coefficient is negative).


A logarithm is just a misspelled algorithm.

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#5 2007-08-12 22:49:15

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Graph of y = x^2 + 6x + 2

They’re the same.

QuadraticCurves.png

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