11 months ago

If x2+y2 = 12 and x2-y2=18, what is the value of x4-y4?

Mathematics

1 answer:

nataly862011 [7]11 months ago

6 0

Answer:

Step-by-step explanation: add the equations

2x² = 30

x² = 15

y² = 12 - 15

= -3

x4 -y4 = 15² - (-3)²

= 216

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Please see the attached image.

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\\
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\\
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\\
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\\
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\\
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