Question

Substract second expression from the first 1. -3x²+y²,4x²+7y²

Answer 1

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$4 {x}^{2} + 7 {y}^{2} - ( - 3 {x}^{2} + {y}^{2} ) \\ = 4 {x}^{2} + 7 {y}^{2} + 3 {x}^{2} - {y}^{2} \\ = 7 {x}^{2} + 6 {y}^{2}$

Answer 2

4x

2

+7y

2

−(−3x

2

+y

2

)

=4x

2

+7y

2

+3x

2

−y

2

=7x

2

+6y

2