Algebraic expressions and formulas
Answers are for parents and teachers.
1
Write “twice a number increased by 9” and “a number divided by 4, then minus 1”.
2x + 9 and x/4 − 1.
2
Simplify 9a + 2b − 4a + 5b.
5a + 7b.
3
Expand 6(2x − 5) and −(4x − 7).
12x − 30 and −4x + 7.
4
Add (6x + 2) and (3x − 9).
9x − 7.
5
The volume of a cube is V = a³. Find V when a = 4 cm.
4 × 4 × 4 = 64 cm³.