Me on this question!

what are the exact solutions of x2 − x − 4 = 0?

x = the quantity of negative 1 plus or minus the square root of 15 all over 2

x = the quantity of 1 plus or minus the square root of 15 all over 2

x = the quantity of 1 plus or minus the square root of 17 all over 2

x = the quantity of negative 1 plus or minus the square root of 17 all over 2

C) x = (1 ± √17)/2

Step-by-step explanation:

x² - x - 4 = 0

Quadratic equation: x = (-b ± (b² - 4ac))/a, where a has x², b has x, and c is only constant

Plug in: x = (1 ± √(1 - 4*1*-4))/2

Multiply: x = (1 ± √(1 + 16))/2

Add: x = (1 ± √17)/2

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

step-by-step explanation:

compare