- simultaneous equations solving on line
- quadratic functions math activities
- simple way of solving equations
- how to graph quadratic equations step by step
- step by step gude to solving linear functions
- tips for quadratic equation
- "how to solve simultanous equations"
- real life quadratic equation exampls
- resolve quadraticfunction
- math question with answer about quadratic equation
- negative numbers 1-step equations
- quadratic equationexplanation
- how to form quadratic equations
- solving quadratic equation and vertex
- a level maths solving quadratic equations
- steps by step to solving quadratic equations
- the tips in solving quadratic equations
- use excel solver, simultaneous equations
- equations solve online
- "what is a quadratic function"
|
|
Quadratic Equation Explain Step By Step
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
