An equation for your number (x) can be written ...
x = x2 - 30
x2 - x - 30 = 0 (arranged in standard form)
(x-6)(x+5) = 0 (factored)
x = 6 or x = -5
A positive number 30 less than its square is 6, which is 30 less than 36.
x = x2 - 30
x2 - x - 30 = 0 (arranged in standard form)
(x-6)(x+5) = 0 (factored)
x = 6 or x = -5
A positive number 30 less than its square is 6, which is 30 less than 36.