How do you solve -20x^2 + 320 = 0?

Jul 23, 2015

x=color(blue)(+4 , -4

Explanation:

$- 20 {x}^{2} = - 320$

$20 {x}^{2} = 320$

${x}^{2} = \frac{320}{20}$

${x}^{2} = 16$

$x = \sqrt{16}$

x=color(blue)(+-4