The value of 102 x 98 is:
6999
6696
9696
9996
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Using the formula,
[∵(x - y)(x + y) = x2 - y2]
102 x 98 = (100 + 2)(100 - 2)
= 1002 - 22
= 10000 - 4
= 9996
Hence, option 4 is the correct option.
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(x + y)(x - y)(x2 + y2)(x4 + y4) is equal to:
x4 + y4
x8 + y8
x8 - y8
2x6y6
(x + 3) (x + 3) - (x - 2) (x - 2) is equal to:
10x + 5
10x - 5
5 - 10x
none of these
If 5a = 302 - 252, the value of a is:
5
11
55