hannahkelly3618
08.03.2020 •
Mathematics
Work out the area of the aquare
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Ответ:
The final expression should be 4x-1
Step-by-step explanation:
The error occurs in the simplification from the 3rd to 4th step. You can see two positive 2x's, but suddenly they vanish.
4 + 2x - 5 + 2x
4 - 5 + 4x
-1 + 4x
4x -1