What is (3 + 5) - (3 to the square power) ?

I got 512.

Step-by-step explanation:

You add 3+5 but you multiply it by 3 to get 512

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.