Question
Write the complex number in standard form.$$(5+2 i)^{2}-4(5+2 i)-1$$
Step 1
Using the formula $(a+b)^2 = a^2 + 2ab + b^2$, we get: $$(5+2i)^2 = 5^2 + 2*5*2i + (2i)^2 = 25 + 20i + 4i^2.$$ Show more…
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