Question

What is the positive solution of x^2 – 36 = 5x

Answer 1

x=9, x=-4(rejected)

Explanation:

rearrange the equation given then equate it to 0.

do the factorisation cross method. since the question asking for positive value then automatically the negative value will be rejected.

Answer 2

Answer: 9

Explanation:

The equation x^2 - 36 = 5x is a quadratic equation and can be solved thus: x^2 - 36 = 5x x^2 - 5x - 36 = 0 x^2 + 4x - 9x - 36 = 0 x(x + 4) - 9(x + 4) = 0 (x - 9)(x + 4) = 0 x - 9 = 0 or x + 4 = 0 x = 9 or x = -4 Therefore, the positive solution of x^2 - 36 = 5x? is 9.