Question

when 40 is subtracted from the square of a number, the result is 3 times the number. Find the positive solution.​

Answer 1

5

Explanation:

Let x be that number.

(x^2) - 40 = 3x

x^2 - 40 = 3x

x*2-3x-40=0

(x-5)(x+8)=0

x=5