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.

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.