Question

what is the formula of x²-y² ? and why? this my bioligic quetion
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Answer 1

Use the fact that: x²-y² = (x-y)(x+y) and x³+y³ = (x+y) (x²-xy+y²) to find the highest power of 2 and the highest power of 3 which divide 5^{36}-1.

Answer 2

Answer:

x²-y²

→ x² + y² = (x + y)² - 2xy