Question

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

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

Answer 1

±2sqrt(10)

Explanation:

40 - x^2 = 0

Add x^2 to each side

40 -x^2 + x^2 = x^2

40 =x^2

Take the square root of each side

±sqrt(40) =sqrt(x^2)

±sqrt(4)sqrt(10) =x

±2sqrt(10) =x