Algebraic Expressions
Algebraic Terms 2a means 2 × a ab means a × b
a2 means a × a a3 means a × a × a
a/b means a ÷ b a2b /c means a × a × b ÷ c
Adding and subtracting terms: you can only add or subtract terms if they are the same type of terms.
Examples: i) 3x + 4x = 7x ii) 13xy – 9xy = 4xy
iii) 5x – 4y + 2x + 6y = 7x + 2y iv) a2 + 3ab – 4b2 + 2a2 – 5ab – 7b2 = 3a2 – 2ab – 11b2
Your Turn: Simplify
a) 7a × 2b b) 3q × 4q c) 6x + 3y + 2x – 2y d) 7p – 3q + 2p + 5q e) 6l + 3m – 4l + 2m – 2l
Collect the terms in these:
a) 7a + 5b + 2a – 6b b) 3x – 4y – 2x + 6y c) p – 5q + 3p – q
d) 2x2 + x – 3x – 4 e) a2 – 5ab + 4ab + b2 f) 4p2 – 5p + 1 – p2 – 2p – 7
g) 5ab – 3bc + ab + 6bc h) 7p2 – 4pq – 2q2 + 6pq i) x2 – 2xy – y2 – x2 + 6xy – 2y2