Add: 3x^2-4xy-8y^2,6xy-9x^2-3y^2,8y^2-6xy-5x^2
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Step-by-step explanation:
3x^2-4xy-8y^2,6xy-9x^2-3y^2,8y^2-6xy-5x^2
=(3x^2-4xy-8y^2) + (6xy-9x^2-3y^2) + (8y^2-6xy-5x^2)
=3x^2-9x^2-5x^2-4xy+6xy-6xy-8y^2-3y^2+8y^2
= -11x^2 -4xy -3y^2
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