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Question

If 13x10=8+5 , then x= .

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Solution

Given: 13x10=8+5

Squaring on both sides,

(13x10)2=(8+5)2

13x10=(8)2+(5)2+25×8

13x10=8+5+240

13x10=13+240

13x10=13+2×210

13x10=13+410

Comparing above equation we get,

x=4

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