Question

What are the solution(s) to the quadratic equation 40 - x2 = 0?

Answer 1

Answer:

  $x=\pm2\sqrt{10}$

Step-by-step explanation:

You want to solve ...

  $40 -x^2=0\\\\40=x^2\qquad\text{add x^2 }\\\\\pm\sqrt{40}=x\qquad\text{take the square root}\\\\\boxed{x=\pm2\sqrt{10}}\qquad\text{simplify}$