The expression is solved to get
A + B = 2x² + y² + 3x
A - B = 3y² - 4x² + 3x
How to solve the expression
From the problem we have the expressions:
A = 2y² + 3x - x²
B = 3x² - y²
Solving for A + B
= (2y² + 3x - x²) + (3x² - y²)
= -x² + 3x² + 2y² - y² + 3x
= 2x² + y² + 3x
A - B
= (2y² + 3x - x²) - (3x² - y²)
= -x² - 3x²+ 2y² + y² + 3x
= 3y² - 4x² + 3x
complete question
If A=2y²+3x-x²,B=3x²-y² then find the value of A+B and A-B