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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

High School Mathematics
2.71 Problems on Radicals Using Formulas - III

Example:
Expand (3 + 2)(3 - 2).
Solution:
The above problem in the form of (a + b)(a - b) = a2 - b2.
Here a = 3 and b =2.
Substitute these values in the above formula we get,
(3 + 2)(3 - 2) = (3)2 - (2)2.
= 3 - 2
= 1
Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: Expand (19 + 3) (19 - 3).
14
None of these
18
16

Q 2: Expand (17 + 2) (17 - 2).
15
-17
-15
17

Q 3: Expand (7 + 8) (7 - 8).
-2
2
-1
1

Q 4: Expand (10 + 5) (10 - 5).
9
5
7
11

Q 5: Expand (10 + 2) (10 - 2).
8
12
6
10

Q 6: Expand (11 + 7) (11 - 7).
4
2
-2
-4

Q 7: Expand (5 + 7) (5 - 7).
2
4
-4
-2

Q 8: Expand (13 + 5) (13 - 5).
8
6
-8
-6

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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