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if sum of a number and …

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if sum of a number and its square root is 90 find number
  • 1 answers

Gaurav Seth 5 years, 1 month ago

Let the positive square root be 'x'
The number is x^2

x^2 +x = 90

x^2+x-90=0
x^2 +10x-9x-90= 0
x(x+10)-9(x+10) =0

X=9, x=-10
x cannot be -10 because square root is positive number.

there x = 9

The number is 81.
 

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