- free quad equation solver software
- examples of word problem using quadratic equation
- quadratic equation steps by steps
- slove the equation -x/3=2
- easy to understand steps to factoring quadratic equations
- simultaneous equation solve ti-83
- quadratic equation poem
- quadratic equation using visual basic
- algebra1/ quadratic equation
- how to use the ti83 to solve for x and how to get the answers using the calculator
- solving sample problems of quadratic equations
- solving quadractic equations games
- best review math
- quadratic vertex calculator
- ask a equation question
- what is the purpose of solving quadratic equations
- ti-89 simultaneous
- quadratic equations step by step guide
- what are the pros and cons of solving equations by graphing, using substitutions, or eliminations.
- an easy way to solve equation
|
|
Solve Simultaneous Equations Enter Values
Solving Quadratic Equations
Looking at an example:
You are given the question
x2+5x+4=0
In the above example,
a=1 (If there is no number before the x then we can assume that thenumber is 1)
b=5
c=4
What we then have to do is find out what x could be equal to in order to satisfy the equation and therefore make it true. In this example, x can either equal -4 or -1 . We don't know yet how we came to this answer, but let's show that both of these answers do work.
Putting -4 into the above equation:
x2+5x+4=0
(-4)2 + (5*-4) + 4 = 0
(-4)*(-4) + (5*-4) + 4 = 0
16 + (-20) + 4 = 0
16-20+4=0
-4+4=0
0=0
This shows that -4 can be a solution for x
Putting -1 into the above equation:
x2+5x+4=0
(-1)2 + (5*-1) + 4 = 0
(-1)*(-1) + (5*-1) + 4 = 0
1 + (-5) + 4 = 0
1-5+4=0
-4+4=0
0=0
This shows that -1 can also be a solution for x
Therefore, there are two possible solutions, -1 and -4. They must both begiven as an answer to obtain full marks.
Once you have obtained the possible solutions for x, is is always necessary to checkthem in the above way
