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25-05-2022
Mathematics

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Simplify the expression to a + bi form: (-12-3i)(-12-3i)

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25-05-2022

Answer:

[tex](-12-3i)(-12-3i)=135+72i[/tex]

Step-by-step explanation:

[tex](-12-3i)(-12-3i)\\\\(-12)(-12)+(-12)(-3i)+(-3i)(-12)+(-3i)(-3i)\\\\144+36i+36i+9i^2\\\\144+72i+9(-1)\\\\144+72i-9\\\\135+72i[/tex]

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