Equations
x+5=11
6
What is the inverse of +5?
-5
42
16
Solve: x2=9
3 and -3
Solve: x+10=18
8
x−4=10
14
What is the inverse of ×3?
÷3
62
36
Solve: x2=16
4 and -4
Solve: 4x=20
5
3x=18
6
What operation undoes subtract 7?
Add 7
92
81
Why does x2=16 have two answers?
positive × positive and negative × negative
What is √64?
8
2x+6=14
4
Solve: x+9=20x + 9 = 20x+9=20 (what operation first?)
Subtract 9
sqrt(49)
7
Solve: x2=36
6 and -6
Solve: 2x+4=12
4
Create an equation where the answer is x=7
e.g. 2x+3=17
Why do we use inverse operations when solving equations?
To undo what was done to x / isolate x
What are the solutions to x2=25?
5 and -5
True or False: x2=49 has only one solution
False
Solve: x2=49
7 and -7