Question

Evaluate the expression described below if the number is 4. The difference between a number squared and the number.

Answer 1

Hello,

$x^2-x=4\\ x^2-x-4=0\\ \Delta=1^2-4*(-4)=17\\ x= \dfrac{1+ \sqrt{17} }{2} \\ or\\ x= \dfrac{1- \sqrt{17} }{2}$