3 years ago

Add blank to each side of x^2-8x=9

Mathematics

1 answer:

Gekata [30.6K]3 years ago

4 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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