Posted by Krissy on Tuesday, February 5, 2013 at 11:18am.
In google type:
quadratic equation online
When you see list of result click on:
Free Online Quadratic Equation Solver:Solve by Quadratic Formula
When page be open in rectangle type your equation
and cilck option:
You will see solutions step-by step and discriminant discusion.
I am only going to do one,
1. Use the discriminant to determine whether the given equation has two irrational roots, two rational roots, one repeated root, or two complex roots.
a.) Two rational roots
b.) one repreated root
c.) two complex roots
d.) two irrational roots.
Write with a zero on the right in form
a x^2 + b x + c = 0
1 x^2 -4 x - 5 = 0
b^2 = (-4)(-4) = 16
-4ac = -4(1)(-5) = +20
b^2 -4ac = 16+20 = 36
sqrt (b^2 - 4ac) = +6
x = [ 4 +/- 6 ] /2
Two REAL Rational roots
sqrt (+36) is a real number
sqrt (+36) is not sqrt( 0) which would give one repeated root
sqrt(+36) is not sqrt(-36) which would leave you with a +/- 6i which is COMPLEX number
it is not sqrt (2) or something which is not a nice rational number and can not be expressed as a ratio of whole numebers
College Algebra - I have a few more questions that I'm not understanding. ...
Excel - I have to create a payroll document for class using Excel and I am quite...
math - Is this the right way to answer this question? A physics exam consists of...
Business Communication - Which way of asking for action carries the highest ...
College Algebra - I need some help with a few problems. They are multiple choice...
Math - I am having trouble figuring out how to do partial derivatives. I have ...
Writing Tests - Lately, for the past couple of tests I've written, I ...
English for john browm - Let me give you something on "multiple-choice"...
College Algebra - I have a few problems I need help with and also do have ...
Math check 3 - f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). I ...
For Further Reading