Question

When 8 is subtracted from the square of a number, the result is 7 times the number. Find the positive solution

Answer 1

The answer would be 8

Answer 2

8

Explanation:

The required relation for number n is ...

n^2 -8 = 7n

n^2 -7n -8 = 0 . . . . subtract 7n

(n +1)(n -8) = 0 . . . . factor

Solutions to this equation are n = -1, or n = 8.

The number is 8.