Alexa wants to use an indirect proof to prove that all rectangles are not squares. She first assumes that all rectangles are squares. Alexa then provides the following counterexample to
disprove her assumption.

She concludes that all rectangles must not be squares.
Which statement best describes Alexa's indirect proof?

A. Alexa's proof is incorrect. She made an error in her counterexample.

B. Alexa's proof is incorrect. She followed the steps of an indirect proof in the wrong order.

C. Alexa's proof is incorrect. She made an error in her assumption.

D. Alexa's proof is correct and contains no errors.

answer: i believe c. is the answer sorry if i am wrong

step-by-step explanation:

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.

each side has a different length.  

step-by-step explanation:

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1