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26 August, 14:42

Type the correct answer in the box. Fill in the missing term in the equation. (1 + 2i) (2 + i) + = 5 (2 + i)

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  1. 26 August, 15:10
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    Well, the first step would be to multiply everything out. 1*2=2, g1*i=i, g2i*2=4i, and 2i*i=2i^2. This would bring the equation to 2+i+4i+2i^2=5 (2+i)

    Next, multiply the other side. 5*2=10, and 5*i=5i. The equation is now:

    2+i+4i+2i^2=10+5i

    Now, combine like terms, and arrange the sides from highest exponents to lowest exponents: i+4i=5i. You can arrange the equation to 2i^2+5i+2=5i+10.

    Subtract 2 from both sides: 2i^2+5i=5i+8

    Subtract 5i from both sides: 2i^2=8

    Divide both sides by 2: i^2=4.

    Finally, find the square root of 4 to get i. The square root of 4 is 2, so i=2.
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