Question

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

O x = +2/10
O x = +4/10
O x = +2V5
O x = +4/5

Answer 1

`x=\pm2√(10)`

Explanation:

You want to solve ...

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