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emmainna [20.7K]
3 years ago
15

Please help!!!!!!!!!!

Mathematics
1 answer:
Lina20 [59]3 years ago
7 0
(3+3i) - (13+15i)

=3+3i-13-15i
=-10-12i
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Solve the following quadratic equation by completing the square: x² + 12x = 15
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Answer:

x = -1.14 or -13.14

Explanations:

The given equation is:

x^2+12x\text{  =  15}

Find the half of 12, and add the square to both sides of the equation.

That is add 6² to both sides

x^2+12x\text{ + 6}^{2}\text{  =  15 + 6}^{2}\begin{gathered} (x+6)^2\text{ =  15  +  3}6 \\ (x+6)^2\text{ = 51} \\  \end{gathered}

Find the square root of both sides:

\begin{gathered} \sqrt[]{(x+6)^2_{}}=\pm\sqrt[]{51} \\ \text{x  +  6  = }\pm\sqrt[]{51} \\ x\text{  =  -6  }\pm\sqrt[]{51} \\ \text{x  = }-6\pm7.14 \\ x\text{  = -6+7.14  = }1.14 \\ x\text{ = -6 - 7.14} \\ \text{x = -13.14} \end{gathered}

x = -1.14 or -13.14

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10 months ago
Compare how you would make a model and note how to find the sum and difference of two stones weighing 2/8 pounds and 3/8 pounds
OverLord2011 [107]
You would subtract 3/8-2/8, which equals 1/8. For drawing a model draw fraction strips to help.
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Help me... I don't really understand and need an explanation
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Answer:

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