Question

Find the wrong step
As 2+2 =4
=4-9/2+ 9/2
=√(4-9/2)^2 + 9/2
=√16-2×4×9/2+(9/2)^2 +9/2
=√16-36+(9/2)^2 +9/2
=√-20+(9/2)^2 +9/2
=√25-45+(9/2)^2 +9/2
=√(5-9/2)^2 +9/2
=(5-9/2) +9/2
=5
ie 4=5
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Answer 1

3rd step is wrong as value of under square root must be positive. Here, when you do 4- 9/2 which has negative value, is wrong.

Answer 2

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