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Expanding two brackets
1.
Objective Be able to
expand brackets and simplify the expressions that arise
2.
Question (Level 6) •
Expand and simplify the following expression (2a + 3)(4a + 2)
3.
Step 1 (2a +
3)(4a + 2) 2a +3 4a +2 Multiply the individuals components together
4.
2a +3 4a 8a2 +2
5.
2a +3 4a 8a2 +12a +2
6.
2a +3 4a 8a2 +12a +2
+4a
7.
2a +3 4a 8a2 +12a +2
+4a +6
8.
Step 2 • Now
collect the like terms 2a +3 4a 8a2 +12a +2 +4a +6 16a
9.
Step 3 So we
have 2a +3 4a 8a2 +12a +2 +4a +6 8a2 + 16a + 6
10.
This will always
work! You may have to deal with negatives too, but don’t worry it’s just as easy.
11.
Dealing with negatives Expand
and simplify the following expression (3b + 2)(4b – 6)
12.
Step 1 (3b +
2)(4b – 6) 3b +2 4b -6 Multiply the individuals components together
13.
3b +2 4b 12b2 -6
14.
3b +2 4b 12b2 +8b -6
15.
3b +2 4b 12b2 +8b -6
-18b
16.
3b +2 4b 12b2 +8b -6
-18b -12
17.
Step 2 • Now
collect the like terms 2a +3 4a 12b2 +8b +2 -18b -12 -10b
18.
Step 3 So we
have 2a +3 4a 12b2 +8b +2 -18b -12 12b2 –10b – 12
19.
That’s it! Just be
careful when you are multiplying negative numbers and take your time when collecting like terms.
20.
Let’s try some
questions – You only have five minutes! • Expand and simplify: 1) (2a + 7)(6a + 2) 2) (4b + 5)(3b +9) 3) (5c + 4)(8c – 2) 4) (7d + 5)(3d – 4) 5) (9y –2)(3y + 6) 6) (4p – 3)(2p – 6) 7) (8m – 2)(7m – 4)
21.
Time is up! Let’s
check some answers
22.
Did you get
them correct? 1) (2a + 7)(6a + 2) 2) (4b + 5)(3b +4) 3) (5c + 4)(8c – 2) 4) (7d + 5)(3d – 4) 5) (9y –2)(3y + 4) 6) (4p – 3)(2p – 6) 7) (8m – 2)(7m – 4) 12a2 + 46a +14 12b2 + 31b +20 40c2 +22c - 8 21d2 – 13d -20 27y2 +30y - 8 8p2 –30p + 18 56m2 – 46m +8
23.
THINK! Did you meet
the objective of the lesson? Be able to expand brackets and simplify the expressions that arise
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