# Algebra 2

Approximate to the nearest tenth the positive real zeroes of f(x)=x^2+1. I got .6

Solve over the set of complex numbers.
x^4-13x^2+36=0 i got -3,-2,2,3 but i don't know if i even did it right.

Solve x^2+4x9=0 by completing the square. I don't even know where to begin on this one. So help me please!!!!! I have a test on this stuff Wed.

1. 👍
2. 👎
3. 👁
1. Huh? x^2 + 1 = 0 has no real zeros
x = + or - sqrt (-1) = +i or -i

let y = x^2
then
y^2 - 13 y + 36 = 0
I will do this by completing the square so you see how
y^2 - 13 y = -36
take half of 13, sqare it, add to both sides
y^2 - 13 y +169/4 = -36 + 169/4
(y-6.5)^2 = 6.25
y - 6.25 = +2.5 or y - 6.25 = -2.5
so
y = 8.75 or y = 3.75
BUT y = x ^2
so
x = + sqrt(8.75)
or
x = -sqrt (8.75)
or
x = + sqrt (3.75)
or
x = -sqrt(3.75)

x^2+4x9=0 This has a typo but I already showed you how to complete square above.
One thing is that coef of x^2 must be one. In your problems it already is, but if it were not, you would have to divide both sides by the non-zero coefficient of x^2 before starting.

1. 👍
2. 👎

## Similar Questions

1. Solve the system of equations y=2x^2-3 y=3x-1 a)no solution b)(-1/2,5),(2,-5/2) c)(-1/2,-5/2),(2,5)**** d)(1/2,5/2),(2,5) 2. How many real number solutions are there to the equation 0=-3x^2+x-4? a)0 ***** b)1 c)2 d)3 3.solve

2. ### Math

Solve the equation. Round to the nearest tenth if necessary. 1#: 7r - 7 = 2r +18 1. r= -5 2. r= 5 3. r= 2.2 4. r= 1.2 _____________________________________________________ Solve the equation. Round to the nearest tenth if

3. ### Mathemathics (teaser)_help

A Professor in havard University, Sent His Phone Number In A Disorderly Manner To His Brilliant Students. The Disordered Phone Number Was 64001128454. To Know His Real Phone Number, He Gave The Students The Following Conditions;

4. ### Calulus

Solve the triangle.Round lenghts to the nearest tenth and angle measurements to the nearest degree. B = 43 C = 107 B = 14

1. ### Math

Solve the following triangle, rounding side lengths to the nearest tenth of a unit and angle measures to the nearest degree. angle a = 153 degrees, b= 5, a=10.5

2. ### Algebra

State the possible number of imaginary zeros of g(x)= x^4+3x^3+7x^2-6x-13 this is how far Ive gotten:there are 4 zeros,3 positive and 1 negative If you've found four real zeroes, then there are no imaginary zeroes. You can also

3. ### algebra

How to solve an equation to the nearest tenth.

4. ### math

Solve the system of equations below by graphing. mc009-1.jpg What are the approximate solutions rounded to the nearest tenth?

1. ### algebra

Solve the equation 2x^2+15x+38=x^2 to the nearest tenth.

2. ### geometry

what is the approximate measure of angle A to the nearest tenth of a degree

3. ### Mathematics

Find the circumference of a circle to the nearest tenth with the points (–10, –10) and(–3, 8) as the endpoints of a diameter. Round your answer to the nearest tenth.

4. ### last 2 questions trig!!

4. Solve the triangle(s), if possible. Round to the nearest tenth. Solve the triangle. Side a = 8, side b = 10, side c = 12 6. Two boats leave the same dock at the same time. The first sails in a straight line N40°W at 36 miles