The simplified expression for the given problem will be :6x² and -10y²
Since the expression given to us is :
3 x² + 5 y²[] + 3 [] + 4 y²+ 6
= 3 x² + 5 y² + 4 y²[][]+6+3
=>3 x² + 9 y² [][]+9
The above equation is equal to 9 x²- y² + 9
=> 3 x² + 9 y² [][]+9 =9 x^2- y^2 + 9
now Equating the coefficients of x²and y² in LHS and RHS:
One box has = 9 x²- y²= +6x²
and the other will have = -y²- 9 = -10y²
To know more expression refers to the link brainly.com/question/14649397
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