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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.38 Problems - II

Example:
If x-y = 3 and xy = 10, find the value of x2+y2.
Solution:
Given that,
x-y = 3
Squaring on both sides, we get
(x-y)2 = 32
x2+y2-2xy = 9
x2+y2-2.10 = 9 (Since xy = 10)
x2+y2-20 = 9
x2+y2 = 9+20
x2+y2 = 29.
Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: If x-y = 12 and xy = 48, find the value of x2+y2.
170
180
150
160

Q 2: If x-y = 4 and xy = 21, find the value of x2+y2.
68
57
58
67

Q 3: If x-y = 3 and xy = 40, find the value of x2+y2.
69
59
89
79

Q 4: If x-y = 3 and xy = 18, find the value of x2+y2.
45
55
35
25

Q 5: If x-y = 6 and xy = 91, find the value of x2+y2.
198
158
238
218

Q 6: If x-y = 10 and xy = 75, find the value of x2+y2.
300
150
200
250

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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