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Mathematics
Geovanni
11 January, 20:15
X^2 - 9
find roots now
+2
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2
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Micah Ellis
11 January, 20:25
0
There are 2 ways to do this.
1) First you need to factor x² - 9.
x² - 9 = (x + 3) (x - 3)
So x = - 3, 3.
2) Let x² - 9 = 0
So then add 9 to both sides and you'll get:
x² = 9
Square root both sides and you'll get:
x = ± 3 (Which is the same thing for - 3, 3)
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Kamila Dennis
11 January, 22:28
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x = 3, - 3
Step-by-step explanation:
To find the roots, or solutions/zeros to this problem first you need to factor the quadratic equation.
In its factored form it looks like this:
(x + 3) (x - 3)
Make both of these factors equal to 0 to find the roots.
(x + 3) = 0
Subtract 3 from both sides ... x = - 3.
(x - 3) = 0
Add 3 to both sides ... x = 3.
The roots of this quadratic equation are 3 and - 3.
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