3 years ago

Simplify the expression to a + bi form: (11+8i)-(-5+4i) PLEASE HELP

Mathematics

2 answers:

WARRIOR [948]3 years ago

4 0

If I’m correct it should be 6+4i good luck

mr_godi [17]3 years ago

4 0

Answer: 16 + 4i

Step-by-Step Explanation:
11 - - 5 = 16
8i - 4i = 4i

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Given the vectors, a=3i+4j, b=-2i+5j, c=10i-j, d=-1/3i+5/2j, find -0.4a-0.3b+0.2d=?

sveta [45]

Answer:

$-\frac{2}{3}i - \frac{13}{5}j$

Step-by-step explanation:

-0.4(3i + 4i) - 0.3(-2i + 5j) + 0.2(- $\frac{1}{3}i$ + $\frac{5}{2}$ j)

-1.2i - 1.6j + 0.6i - 1.5j - $\frac{0.2}{3}$ i + 0.5j

Converting to fraction form;

$-\frac{6}{5}i + \frac{3}{5}i - \frac{1}{15}i - \frac{8}{5}j - \frac{3}{2}j + \frac{1}{2} j$

<u>Solving the i part;</u>

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<u>Solving the j part;</u>

$\frac{-16j-15j+5j}{10} = -\frac{13}{5}$ j

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Using a calculator I put 1,284/26=49.384615385. Rounded to tenth: 49.4 :)

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