Select all of the following that are quadratic equations.
5x2+ 15 x=0
6 *- 1 = 4 x + 7
x2.4 x= 4 x + 7
02x-1=0
3x2 + 5 x 7=0
03. 2x2 + 1 = 0

look a the sides they are perpendicular

answer: 2/4

step-by-step explanation:

afjnawenkfnjaw; enkanwelwaklalejjaw; fij

step-by-step explanation:

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!