- "hardest maths questions"
- how to calculate quadratic equation on ti 84 calculator
- list of quadratic functions
- how to solve simultaneous equations by factorisation method
- quadratic equations movement
- calculate the roots of quadratic equations with matlab
- khavinson + astronomy
- solving equations online with working
- simultaneous equations online calculator
- help explain graphing quadratic equations
- why factorise
- simultaneous equation easy
- simultaneous equation solver5c
- fithra faisal hastiadi
- explain what it means to solve a quadratic equation
- quadratic function problem solving with examples
- solving simultaneous equations with ti89
- "systems of equations can be solved by graphing or by using"
- aquad solver
- quadratic equation -b
|
|
Quadratic Equation Format
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
