what is a number where the square of itself is 195 more than twice the number

Answer 1

x^2 = 195 +2 x
x^2 - 2 x - 195 = 0
195/15 = 13 good
(x-15)(x+13) = 0
x = 15

check
225 = 195 + 30?
yes

Answer 2

What two whole numbers is the following square root between?



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a
12-13
b
13-14
c
14-15
d
15-16