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defon
3 years ago
15

When r=4, what is the value of (9-r)2

Mathematics
1 answer:
fenix001 [56]3 years ago
6 0
The answer is 10.....Hope it helps..
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skad [1K]
Hey! Apologies that I can’t make this look nice because I’m on mobile.

To simplify this, we can multiply the denominator by its conjugate. For a imaginary function (a+bi), its conjugate would be (a-bi), so we can apply that here to multiply both sides by (2-i)/(2-i). This works because it simplifies to one. Then, we have our fraction as 4*(2-i)/((2-i)(2+i))=(8-4i)/(4-i^2)=(8-4i)/5

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3 years ago
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