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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.37 Problems - I

Example:
If x+y = 7, xy = 12, find the value of x2+y2.

Solution:
Given that,
x+y = 7
Squaring on both side, we get
(x+y)2 = 72
x2+2xy+y2 = 49
x2+2.12+y2 = 49 (Since xy = 12)
x2+y2+24 = 49
x2+y2 = 49-24
x2+y2 = 25.


Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: If x+y = 10, xy = 21, find the value of x2+y2.
57
58
52
56

Q 2: If x+y = 8, xy = 15, find the value of x2+y2.
44
34
54
64

Q 3: If x+y = 5, xy = 6, find the value of x2+y2.
7
13
9
8

Q 4: If x+y = 10, xy = 16, find the value of x2+y2.
58
78
48
68

Q 5: If x+y = 9, xy = 14, find the value of x2+y2.
51
59
57
53

Q 6: If x+y = 12, xy = 20, find the value of x2+y2.
144
134
154
124

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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