Resultant displacment and magnitude

[djtsmith007]

Homework Statement

A man pushes a mop across the floor causes the mop to undergo two displacements. The first has a magnitude of 235cm and makes an angle of 131⁰ with the positive x-axis.

The resultant displacement has a magnitude of 215cm and is directed at an angle of 49⁰ to the positive x-axis.

Find the magnitude of the second displacement. Answer in units of cm.

Homework Equations

R=√(Aˆ2+Bˆ2-2AB(cos(Φ)))

Sinβ=B/R(Sin(Φ))

The Attempt at a Solution

Tried using the above equation and not getting the right answer.
What am i doing wrong?
I set
R=215
A=235
B=X second displacement
Φ=49⁰

 

[mikelepore]

A+B=R implies B=R-A. Find the x and y components of R and A, then recall how to subtract two vectors when you know their components.