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Law Incorporation [45]
3 years ago
11

I need help for algebra 2 for simplify form for example (3x-2i)(3x+2i)

Mathematics
2 answers:
Setler79 [48]3 years ago
8 0
(a+b)(a-b)=a^2-b^2\\\\
(3x-2i)(3x+2i)=\\
9x^2-4i^2\\
\\
i=\sqrt{-1}\\
i^2=-1\\
\\
9x^2-4\cdot (-1)=9x^2+4
grandymaker [24]3 years ago
6 0
Let's start...

(3x-2i)*(3x+2i)

3x*3x+3x*2i-2i*3x-2i*2i

9x^2+6xi-6xi-4i^2

9x^2-4i^2

we don't finish it yet...

i^2=-1

Let's replace it

9x^2-4*(-1)

\boxed{\boxed{9x^2+4}}
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