Sunshine447
Where does the graph of x2  x  2 = y cross the xaxis?



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zzr0ck3r
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when y = 0
x^2  x  2 = 0
x^2 +x2x2=0
x(x+1)2(x+1) = 0
(x+1)(x2)=0
x = ? and x = ?

Sunshine447
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1 & 2?

zzr0ck3r
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when x = 1 (x+1)(x2) = (1+1)(12) = 2(1) = 2

zzr0ck3r
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almost break it up
x+1 = 0 or x2 = 0

Sunshine447
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1&2

zzr0ck3r
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notice the only time two things multiplied by each other can = 0 is if one or the other is 0

Sunshine447
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ok thanks!