Question

2 x2 - 3 y2 5 x2 + 6 y2 - 3 x2 - 4 y2​

Answer 1

Step-by-step explanation:

Answer

Required sum,

=(2x2−3y2)+(5x2+6y2)+(−3x2−4y2)

Collecting like terms,

=2x2+5x2−3x2−3y2+6y2−4y2

Adding like terms,

=(2+5−3)x2+(−3+6−4)y2

=4x2−y2

Answer 2

$\huge \underline \mathfrak{answer}$

Required sum

=(2x ² −3y² )+(5x²+6y² )+(−3x²−4y²)

Now

Collecting like terms,

=2x ² +5x²−3x² −3y² +6y ² −4y ²

after this...

Adding like terms

=(2+5−3)x² +(−3+6−4)y ²

=4x ² −y ²