4 use of intersections of graphs to solve equations Flashcards
1
Q
How could you show that there are no points of intersection between two curves?
A
-Work out the discriminant and show it is less than 1, which shows no solutions.
2
Q
How do you show that a curve has two points of intersection?
A
-Work out discriminant and should be greater than 0.
3
Q
How do you express an inequality as set notation?
A
When it is a double inequality you can put {x: (inequity)}
When it is two separate you can put {x: inequality} u {x:ineqality
double in n and two singles is u
4
Q
How can you solve the inequality 5/x-3<2
A
-Multiply out by x-3
5
Q
How do you know when f(x)>g(x)?
A
The values where f(x) is above g(x)
