Negative solution

Question

The difference of the square of a number in 5 = 4 times that number find the negative solution

Answer 1

25*4=100

25=5^2

so -5^2=25?????????

Answer 2

Do you mean x² - 5 = 4x?

Then, x² - 4x - 5 = 0

(x - 5)(x + 1) = 0

So, x = 5 or x = -1