express the complex number in x+iy (1+2i)×(1-2i)
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Step-by-step explanation:
=(x+2ix+iy+2i²y)(1-2i).
=(x+2ix+iy-2y)(1-2i)
=(x-2ix+2ix-4i²x+iy-2i²y-2y+4iy)
=(x+4ix+5iy+2y-2y)
=(x+4ix+5iy)
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