Question

Can you please check these problems?

1. -4�ã2+6�ã72-�ã32=_____

I got 2

2. 5�ã28+2�ã7-�ã14=_____

I got 12�ã7-�ã14

3. -3�ã72+6�ã52-7�ã128=______

I got -89�ã8+12�ã13-56�ã2

4. 4�ã112+5�ã56-9�ã126=____

I got -17�ã14+16�ã7

Answer 1

#1

-4√2+6√72-√32
= -4√2 + 6√36√2 - √16√2
= -4√2 + 36√2 - 4√2
= 28√2

#2 ok

#3 12√13-74√2
remember that √8 = 2√2

#4 ok