Posted by Victoria on Friday, April 25, 2014 at 4:36pm.
Find the roots of each quadratic polynomial.
1. x^2 + 2
2. x^2  6x  7

Algebra 1 (Reiny)  Damon, Friday, April 25, 2014 at 4:48pm
1. 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
(x7)(x+1) = 0

Algebra 1 (Reiny)  Victoria, Friday, April 25, 2014 at 4:57pm
I'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 5:05pm
If 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 5:16pm
I 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?
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