Solve the quadratic equation by completing the square.

x2 - 10x + 18 = 0

A) x = 5 ±
7
B) x = -5 ±
7
C) x = 5 ±
43
D) x = -5 ±
43

A

Step-by-step explanation:

x² - 10x + 18 = 0

x² - 2(x)(5) + 5² - 5² + 18 = 0

(x - 5)² = 7

x = 5 + sqrt(7), 5 - sqrt(7)

sqrt: square root

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

answer: 7270

step-by-step explanation: