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AfilCa [17]
3 years ago
13

c. Use the identity for the difference of two squares, , and the imaginary number i to create an identity for the sum of two squ

ares. Show that the identity is true.
Mathematics
1 answer:
mash [69]3 years ago
5 0
The identity for the difference of two squares is
a² - b² = (a + b)(a - b)

Note that by definition, i² = -1.
Then
a² - (bi)² = a² - i²b² = a² - (-1)b² = a² + b².

Also from the identity,
a² - (bi)² = (a + bi)(a - bi) = a² - abi + abi - i²b² = a² - (-1)*b² = a² + b²

Therefore
a² - (bi)² = a² + b²

This identity is true.

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