Which expressions represent a quadratic expression in factored form

quadratic equation is 2 degree polynomial

x2 - x -72 = x2 - 9x +8x -72

x(x - 9 ) + 8(x - 9) = (x -9) (x+8)

1st correct - quadratic

2nd correct - quadratic

3rd - it's linear equation, not quadratic

4th - correct - quadratic

5th - linear - not correct

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

the first one, all those points on the line just make a strait line.