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 Â
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
