Which of the following is a solution of x2 + 4x = −8? x=-2-2ix=2+2ix=-4+4ix=4-4i

x=-2-2i

Step-by-step explanation:

There are 4 ways to solve quadratic equations. These are factorization, completing the square, formula and graphical methods.

Using the formula method, considering a quadratic equation

ax^2 + bx + c = 0,

x = (-b±√(b² - 4ac))/2a

Given x2 + 4x = −8

= x2 + 4x + 8 = 0

a = 1, b = 4 ,c = 8

x = (-4±√(4² - 4×1×8))/2×1

x = -4±√-16/2

x = -4±4i/2

x = -2±2i

x = -2-2i, x = -2+2i

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %