Question

X2 – 12x = 39

Please help me solve this! I need the answer ASAP

Answer 1

x = 6 ± 5* OR 6 - 5*

Explanation:

In decimal form it would be either 14.66025403... or -2.66025403

Hope this helps!

Answer 2

x = 6 ± 5
`√(3)`

Explanation:

Given

x² - 12x = 39

Using the method of completing the square

add ( half the coefficient of the x- term)² to both sides

x² + 2(- 6)x + 36 = 39 + 36

(x - 6)² = 75 ( take the square root of both sides )

x - 6 = ±
`√(75)` = ± 5
`√(3)` ( add 6 to both sides )

x = 6 ± 5
`√(3)` ← solutions in exact form