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Mathematics
Gideon Mccullough
2 April, 08:04
Add blank to each side of x^2-8x=9
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Jerome Hogan
2 April, 09:57
0
Step-by-step explanation:
To complete the square, take half of the second coefficient, square it, then add the result to both sides.
(-8/2) ² = (-4) ² = 16
x² - 8x + 16 = 9 + 16
Solving:
(x - 4) ² = 25
x - 4 = ±5
x = 4 ± 5
x = - 1 or 9
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