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Can someone please solve by completing the square?
x^2-8x+9=0
2 Answers
- Anonymous9 years ago
xsquared-8x=-9
xsquared-8x+16=7 note that the #where the 9 was is half of B and the square of it
(x-4)squared=7
x-4=plus or minus√7
x=plus or minus√7+4
confusing, but hope it helps
- δοτζοLv 79 years ago
Isolate the variables:
x² - 8x = -9
Add the square of half the linear coefficient to both sides:
x² - 8x + (8/2)² = x² - 8x + 16 = 7 = -9 + 16
Factor the left side:
(x - 4)² = 7
Solve from there, don't forget the ± when the square root is taken.
