Question

Which of the following is the standard form of the equation 5x2 - 20x = 15?
A. x2 - 4x = 3
B.x2 - 4x - 3 = 0
C.5x2 - 20x - 15 = 0

Answer 1

It is C. The first part is raised to the 2nd power. so it goes first since that is the highest. then the -20x because variables are understood to the power of 1, while normal numbers are understood to the power of 0. so the order is highest to lowest (2,1,0)

Answer 2

$5x^2 - 20x = 15$

Divide both sides by 5, it would give :

$x^2-4x=3$

After it gives : 

$x^2-4x-3=0$

So the answer would be : B.

Hope this helps !

Photon