USing calculator to evaluate quadratic equations

1. EVALUATION OF QUADRATIC EXPRESSION
Complete linear/quadratic/logarithm table
Evaluate an epression
Uses the [CALC]
Two methods

2. METHOD 1

3. STEPS
1. Type the expression
2. Press [CALC]
3. Press the given value(s) of the unknown (x)
4. Press [=]
NB: press [CALC] anytime you want to find the corresponding ‘y’
value for some ‘x’

4. STEPS
1. Press [MODE]
2. Press 7 (TABLE). You will see f(x)=
3. The the question. You will get
F(x) = (relation/question)
4. Press [=]

5. 4. Start? Press the starting value of x and press [=]
5. End? Press the end value of x and press [=]
6. Step? (the interval between the x values) press [=]
7. Press [Down] to see the other values in the table.
NB: when done, clear the function

6. EXAMPLES

7. Copy and complete the table for the relation y = x2 – x – 6 . For the intervals -3 ≤ x ≥ 4
x -3 -2 -1 0 1 2 3 4
y -6

8. SOLUTION
1. Press [MODE]
2. Press 7 (TABLE). You will see f(x)=
3. The the question. You will get F(x) = x2 – x – 6
4. Press [=]

9. 4. Start? Press the starting value of x and press [=] i.e. –
3
5. End? Press the end value of x and press [=] i.e. 4
6. Step? (the interval between the x values which is 1.)
press [=] you can skip this
7. Press [Down] to see the other values in the table.
NB: when done, clear the function

10. Follow the same procedure to solve all examples

11. Copy and complete the table for the relation y= 3 + 2x – x2. for the interval -2 ≤ x ≥ 4
x -2 -1 0 1 2 2.5 3 3.5 4
y 3

12. Copy and complete the table for the relation y= 1
2
(x – 3)( x + 1). For the interval -3 ≤ x ≥ 5
x -3 -2 -1 0 1 2 3 4 5
y 1.5

13. NOTE
The knowledge acquired in evaluation of quadratic expression
can be applied in:
Evaluation of all other expression
Binary operation
Simplification of expressions
Function (i.e. finding the image of a function)
Series and sequences and many more