Question

P=b+2a+2c for b=

Answer 1

Think of equations as a scale. What you do to one side, you HAVE to do to the other.

So if you have the equation:
P = b + 2a + 2c, and you want to solve for b, get rid of everything that is with b.

In this case, you have a 2a, and a 2c, so get rid of them (- 2a - 2c), but remember, you have to do the same thing to the other side, or it's no longer an equation.

P = b + 2a + 2c
-2a -2c -2a - 2c

P -2a -c2 = b

Answer 2

so how do i write it?

Answer 3

b = P - 2a -2c, sorry, that was a typo

Answer 4

I accidentally wrote -c2. Technically, it's still the same answer, but usually, they want the answer with the variable they're asking for first, in this case, b. Which is why it's:
b = P -2a -2c. Hope I didn't confuse you there.