Question

Start with : -20 = -20

Then, we can write: 25 - 45 = 16 - 36

But also we can say: 5^2 - 5 * 9 = 4^2 - 4 * 9

We add 81/4 to both sides (is an equality, the result doesn't be affected
5^2 - 5 * 9 + 81/4 = 4^2 - 4 * 9 + 81/4

As 81/4 its equals to (9^2/2^2) and this is equals to (9/2)^2 then we can write:
5^2 - 5 * 9 + (9/2)^2 = 4^2 - 4 * 9 + (9/2)^2

Both sides from the equality makes an perfect square binomial, then factorizing:
(5-9/2)^2 = (4-9/2)^2

Boths sides are square up so we can make square root
√(5-9/2)^2 = √(4-9/2)^2

Square root gets eliminated so we have:
(5-9/2) = (4-9/2)

We add 9/2 for both sides and we have:
5 - 9/2 + 9/2 = 4 - 9/2 + 9/2

Making both operations we have:
5 = 4

Where is the error?

Answer 1

Step-by-step explanation:

Boths sides are square up so we can make square root

√(5-9/2)^2 = √(4-9/2)^2.

here is error. check it

Answer 2

Answer:

5 - 9/2 + 9/2 = 4 - 9/2 + 9/2 -> error is here

Step-by-step explanation:

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