- book of quadratic word problems
- when would i use a quadratic function in real life
- help solving quadratic equations that27s not in standard form
- equasion solver
- how to work out quadratic function
- basic simultaneous equations with graphing
- steps to do quadratic equations
- solving quadratic with substitutions
- steps when solving quadratic equations
- the use of quadratic formula in life
- solve equations online
- quadratic equations can be solved by graphing2c using the quadratic formula2c completing the square2c and factoring. what are the pros and cons of each of these methods3f
- "simultaneous equations" solver
- scientist2dsymmetry
- how to put a quadratic equation in a ti-89 calculator
- quadratic formulas
- choosing the right quadratic equation
- step by step guide to solving simultaneous equations
- equation solver by substitution calculator
- excel formula parabolic sar
|
|
Solving A Quadratic Function
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
