Illa796 Illa796

28-04-2014
Mathematics

contestada

If x² – y² = 8 and x²+ y² = 4, then what is the value of x⁴ – y⁴?

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leonghw leonghw

28-04-2014

x^2 - y^2 = 8
x^2 + y^2 = 4
Therefore: (x^2 - y^2 ) * (x^2 + y^2 ) = 8 *4
Expanded: x^4 + x^2 y^2 - x^2 y^2 - y^4 = 32
So: x^4 - y^4 = 32

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