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Alisson Baker
Mathematics
14 April, 19:49
X² - 2x - 8=0
How do I complete the square
+3
Answers (
1
)
Jackson Hardin
14 April, 19:56
0
X=-2
Step-by-step explanation:
Solution by completing the square for:
x2-2x-8=0
Keep x terms on the left and move
the constant to the right side
by adding it on both sides
x2-2x=8
Take half of the x term and square it
[-2⋅12]2=1
then add the result to both sides
x2-2x+1=8+1
Rewrite the perfect square on the left
(x-1) 2=8+1
and combine terms on the right
(x-1) 2=9
Take the square root of both sides
x-1=±9-√
Cannot Simplify the Radical term (1):
Isolate the x on the left side and
solve for x (1)
x=1±3
therefore (2)
x=1+3
x=1-3
which becomes
x=4
x=-2
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