# Smart problem

**Algebra**Level pending

1) -20=-20

2) 16-36=25-45

3) 16-36+\(\frac{81}{4}\)=25-45+\(\frac{81}{4}\)

4) 4^{2}+(\(\frac{9}{2}\))^{2}-2x4x\(\frac{9}{2}\)=5^{2}+(\(\frac{9}{2}\))^{2}-2x5x\(\frac{9}{2}\)

5) (4-\(\frac{9}{2}\))^{2}=(5-\(\frac{9}{2}\))^{2}

6) ((4-\(\frac{9}{2}\))^{2})^{0.5}=((5-\(\frac{9}{2}\))^{2})^{0.5}

7) 4-\(\frac{9}{2}\)=5-\(\frac{9}{2}\)

8) 4=5

9) 2+2=5

Where is the first mistake occurs?