Respuesta :

deku
To solve for x^2 - 40 = 9, take the square roots of both sides and solve.
The answer is x = 7, -7.
[tex] x^{2} -40= 9[/tex]

[tex] x^{2} = 49[/tex]

[tex] \sqrt{ x^{2} } = \sqrt{49} [/tex]

x = +7 or -7