X=value of the house before increase
(100%+29%)X=516,000
(129%)X=516,000
1.29x=516,000 | divided by 1.29 both sides
X=400,000$ was the value when it was purchased
8x^2 plus 8x , use the box method ! It is very helpful for area and any other multiplication
Check the picture below. Recall your SOH CAH TOA.
6
Like how

= 36
Square root does the opposite.
Edit: my mistake, it is 6
Answer: can you explain it more?
Step-by-step explanation: