Question

the sum of a certain number and it's sqare root is 90. the number is

Answer 1

According to the question.....
x + x^1/2 = 90
So, x^1/2 = 90 - x
Squaring both sides,
x = (90 - x) ^2
x = 8100 + x^2 - 180x
0 = 8100 + x^2 - 181x
From here we get zeroes as 100 and 81
So the no is 9 or 10

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