Asked by ashley

how do you find the x-intercepts y=x^2+2x-3
Answered by Reiny
at the x-intercept, y = 0

so solve
x^2 + 2x - 3 = 0

The factors are obvious
Answered by ashley
I still am confused, but let me try this

(x-1)(x+2) but I am not sure where to go from here
Answered by drwls
lYou factored it correcty.

The only way (x-1)(x+2) can equal zero is for one OR the other of the two factors to be zero.

Therefore x = 1 or -2.
Answered by ashley
oh makes sense! Because once you put them on the opposite side of the equation they would change fromeither positive to negative or negative to positive.
Answered by Damon
I think the factors are
(x+3)(x-1)
so solutions are
-3 and +1
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