20*^2-30x-40 solve for x

x = 12

Step-by-step explanation:

Solve for x:

360 - 30 x = 0

Subtract 360 from both sides:

(360 - 360) - 30 x = - 360

360 - 360 = 0:

-30 x = - 360

Divide both sides of - 30 x = - 360 by - 30:

(-30 x) / (-30) = (-360) / (-30)

(-30) / (-30) = 1:

x = (-360) / (-30)

The gcd of 360 and - 30 is 30, so (-360) / (-30) = ( - (30*12)) / (30 (-1)) = 30/30 * (-12) / (-1) = (-12) / (-1):

x = (-12) / (-1)

(-12) / (-1) = (-1) / (-1) * 12 = 12:

Answer: x = 12