Find the best answers to your questions with the help of IDNLearn.com's expert contributors. Discover prompt and accurate answers from our community of experienced professionals.
Sagot :
Let's start...
[tex](3x-2i)*(3x+2i)[/tex]
[tex]3x*3x+3x*2i-2i*3x-2i*2i[/tex]
[tex]9x^2+6xi-6xi-4i^2[/tex]
[tex]9x^2-4i^2[/tex]
we don't finish it yet...
[tex]i^2=-1[/tex]
Let's replace it
[tex]9x^2-4*(-1)[/tex]
[tex]\boxed{\boxed{9x^2+4}}[/tex]
[tex](3x-2i)*(3x+2i)[/tex]
[tex]3x*3x+3x*2i-2i*3x-2i*2i[/tex]
[tex]9x^2+6xi-6xi-4i^2[/tex]
[tex]9x^2-4i^2[/tex]
we don't finish it yet...
[tex]i^2=-1[/tex]
Let's replace it
[tex]9x^2-4*(-1)[/tex]
[tex]\boxed{\boxed{9x^2+4}}[/tex]
[tex](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[/tex]
We appreciate your contributions to this forum. Don't forget to check back for the latest answers. Keep asking, answering, and sharing useful information. Thank you for choosing IDNLearn.com. We’re dedicated to providing clear answers, so visit us again for more solutions.