What are the solutions of the equation x4 + 6x2 + 5 = 0? Use u substitution to solve. x = i and x = i5
x=+ i and x
x= +115
O x=V-1 and x = = -5
x=+ -1 and x = = -5

A; The first choice.

Step-by-step explanation:

We have the equation and we want to solve using u-substitution.

When solving by u-substitution, we essentially want to turn our equation into quadratic form.

So, let . We can rewrite our equation as:

Substitute:

Solve. We can factor:

Zero Product Property:

Solve for each case:

Substitute back u:

Take the square root of both sides for each case. Since we are taking an even root, we need plus-minus. Thus:

Simplify:

Our answer is A.

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation: