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

Question

asked Feb 6, 2021 142k views

2 Answers

Aurelien Ribon · Answer 1 · 2021-02-12T17:05:38+0000

Answer:

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.