Question

MEGA POINTS... CAN CHAT AFTERWARDS...

Solve the equation by completing the square.

x^2 - 18x +__= 4 + ___

A. 324
B. 81
C. 9
D. 18

Answer 1

B

Explanation:

Answer 2

B

Explanation:

Given

x² - 18x + --- = 4 + ----

To complete the square

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

x² + 2(- 9)x + 81 = 4 + 81

(x - 9)² = 85 ( take the square root of both sides )

x - 9 = ±
`√(85)` ( add 9 to both sides )

x = 9 ±
`√(85)` ← exact solutions