Friday

August 29, 2014

August 29, 2014

Posted by **Victoria** on Friday, April 25, 2014 at 4:36pm.

1. x^2 + 2

2. x^2 - 6x - 7

- Algebra 1 (Reiny) -
**Damon**, Friday, April 25, 2014 at 4:48pm1. x^2 = -2

x = +/- i sqrt 2 imaginary roots

2. x = [ 6 +/- sqrt (36+28) ] / 2

= 3 +/- 4

7 or -1

or just factor it

(x-7)(x+1) = 0

- Algebra 1 (Reiny) -
**Victoria**, Friday, April 25, 2014 at 4:57pmI'm sorry, but I don't understand. I haven't learned about this solving method yet. What are imaginary roots?

- Algebra 1 (Reiny) -
**Damon**, Friday, April 25, 2014 at 5:05pmIf you have not learned about imaginary roots then you have a typo in number 1

You can not solve

x^2 = -2

Unless you have had complex numbers.

You can do number two the second way I did it, by factoring.

- Algebra 1 (Reiny) -
**Victoria**, Friday, April 25, 2014 at 5:16pmI haven't learned to factor quadratic equations yet, either. In my current lesson, I'm learning to solve quadratic equations by graphing. However, I am struggling to grasp the concept. Thus, what is a simple way to find the roots of quadratic equations by graphing?

**Related Questions**

Algebra 1 (Reiny) - Find the roots of each quadratic polynomial. 1. x^2 + 2 2. ...

Algebra 1 - Find the roots of each quadratic polynomial. 1. 16x + 40 + 2x^2 ...

algebra - solve the polynomial y=2x^2-4x+1 For Further Reading algebra - Reiny, ...

Algebra - Given the roots, 1/2 and 4, find: (A) The quadratic equation 2x^2-9x+4...

Algebra 2 - How do I solve polynomial equation by finding all complex roots? The...

Alg II - I'm working with finding roots of polynomial equations with degrees of ...

Alg II - I'm working with finding roots of polynomial equations with degrees of ...

Algebra - Find the number of integer quadruples (a,b,c,d) with 0\leq a,b,c,d \...

Algebra - Find the number of integer quadruples (a,b,c,d) with 0\leq a,b,c,d \...

College Algebra - Solve the following equation in the complex number system x^4+...