Posted by **Lucy** on Tuesday, June 16, 2009 at 2:18pm.

Given that y=x^2+2x-3

When x is -3 what is y?

Is the ans 0?

When x is 1 what is y?

Is the ans 0?

- Maths -
**Sally**, Tuesday, June 16, 2009 at 6:10pm
if x=-3, then y=-3, not zero:

y=-3^2-6-3

y=6-6-3

y=-3

Does this make sense?

if x=1, then y=0, you are correct:

y=1^2+2-3

y=1+2-3

y=3-3

y=0

Does this make sense?

Hope this helps!! :-)

- Maths -
**PsyDAG**, Wednesday, June 17, 2009 at 11:38am
Sally has made a mistake. (-3)^2 = 9 not 6.

y=-3^2-6-3 = 9 - 6 - 3 = 0

The second value solution is correct.

I hope this helps a little more. Thanks for asking.

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