There is a question that I can never figure out why it is wrong. Here is the question:

16-36=25-45

= -20

16-36+20.25=25-45+20.25

add 20.25 to both sides

FOIL / Complete the square...

(4-(9/2))^2 = (5-(9/2))^2

Sqrt it.

4-(9/2) = 5-(9/2)

add both sides by 9/2

4=5

why is it wrong?

This question held me prisoner for 5 hours and I just lost my last bit of hand-eye coordination.

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Engineer223