It’s 17 i’m pretty sure because 20+ 5 is 25 and 25 - 10 is 15 then 15+5=20 and 20-3 is 17
Answer:
Solving the expression
we get: 
Step-by-step explanation:
We need to solve the expression: 
This is a quadratic expression and it can be solved using quadratic formula
Solving:

we can write it as:

The quadratic formula is: 
where a = 3, b = -2 and c= 1
Putting values and solving:

So, solving the expression
we get: 