What is the length of EF in the right triangle below?

36

Step-by-step explanation:

use the Pythagorean theorem, which is a^2+b^2=c^2 where c is always the hypotenuse and a & b can be interchangeable because they are just the legs.

in this case the hyp is 39

so 39^2=15^2+EF^2

which can also be 39^2-15^2=ef^2

1521-225=ef^2

now square root both sides to get just ef

ef= square root of 1296

ef=36

its ok i have one too and i also have big lips

step-by-step explanation:

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option