Posted by **Cynthia** on Thursday, December 13, 2012 at 2:19pm.

The numbers i5 and -i5 are solutions to which equation?

a. x^2+5=0

b. x^2+5=0

d. x^2-5=0

- Algebra 2 -
**Cynthia**, Thursday, December 13, 2012 at 2:22pm
thank you do you know how to do it though?

- Algebra 2 -
**Steve**, Thursday, December 13, 2012 at 2:32pm
of course. I got the answer

you say √5i and -√5i are the solutions, so

(x-√5i)(x+√5i) = 0

x^2 - (√5i)^2 = 0

x^2 - 5i^2 = 0

but i^2 = -1, so

x^2 + 5 = 0

- Algebra 2 -
**Cynthia**, Thursday, December 13, 2012 at 2:35pm
omg thank you soooo much (:

## Answer This Question

## Related Questions

- Algebra II - 1)What method(s) would you choose to solve the equation: x2 + 2x - ...
- ALGEBRA - The table below shows two equations: Equation 1 |3x - 1| + 7 = 2 ...
- college - Write a quadratic equation in the variable x having the given numbers ...
- Algebra - Find a quadratic equation that has the numbers below as solutions. 1. ...
- algebra - write a quadratic equation having the given numbers as solutions. -6 ...
- algabra - Write a quadratic equation in the variable x having the given numbers ...
- math - compare and contrast: below are two equations. solve each equation and ...
- algebra - Write a quadratic equation in the variable x having the given numbers ...
- algebra - Write a quadratic equation in the variable x having the given numbers ...
- algebra - Write a quadratic equation in the variable x, having the given numbers...

More Related Questions