Select all of the following that are quadratic equations
a 5 x-1=3x+8
b 5x-3=0
c x^2-2x=4x+1
d 2x^2+12x=0
e x^3-6x^2+8=0
f 9x^2+6x-3=0

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

( - 4 , -7 )

all the lines must parallel  

step-by-step explanation:

coordinates of c = ( - 1 , 2 )

3 units left = ( -4 , 2 )

9 units down = ( - 4 , 11 )