If A = 5x2 + 3xy + 2y2 , B = – 2y2 – 3xy + 4x2 then A + B = ……

1.	If A = 5x2 + 3xy + 2y2 , B = – 2y2 – 3xy + 4x2 then A + B = ……………….. A) 9x2 + 6xy B) 4y2C) x2 + 4y2 + 6xy D) 9x2
Answer» Correct option is D) 9x² Correct option is (D) 9x² A + B = \((5x^2+3xy+2y^2)\) \(+(-2y^2–3xy+4x^2)\) \(=(5+4)x^2+3xy-3xy+2y^2-2y^2\) \(=9x^2.\)

If A = 5x2 + 3xy + 2y2 , B = – 2y2 – 3xy + 4x2 then A + B = ……………….. A) 9x2 + 6xy B) 4y2C) x2 + 4y2 + 6xy D) 9x2

Answer»

Correct option is D) 9x²

Correct option is (D) 9x²

A + B = \((5x^2+3xy+2y^2)\) \(+(-2y^2–3xy+4x^2)\)

\(=(5+4)x^2+3xy-3xy+2y^2-2y^2\)

\(=9x^2.\)