Find the number, if sum of that number and its square is 2070.

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11 Feb 2021 Number

Find the number, if sum of that number and its square is 2070.

OPtion

1) 46
2) 40
3) 36
4) 42
5) 45
6) 54
7) 50
8) -46
9) -45
10) None of the above

Solution

Let the number be n.
n2 + n = 2070 Eq- i
n2 + n – 2070 = 0
by solving:
(n +46 ) (n – 45) = 0
n = 45

Correct Option: 5 Best Solution (3)