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Darina [25.2K]
3 years ago
15

HELP!

Mathematics
1 answer:
Elden [556K]3 years ago
3 0

Answer:

(-7)+(-2)

Step-by-step explanation:

Which other expression has the same value as (-7) – 2?

The expression given :

(-7) – 2 = - 7 - 2 = - 9

To obtain our answer, we find the result of the expressions given in the option :

(-7)+2 = - 7 + 2 = - 5

7- (-2) = 7 - - 2 = 7 + 2 = 9

7+(-2) = 7 - 2 = 5

(-7)+(-2) = - 7 + - 2 = - 7 - 2 = - 9

Only option D gives the same result as the result of the expression given ; hence, our answer is option D

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3 years ago
Whats the answer?<br><br> 12m +5 =17
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12m+5=17

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What are the roots of the equation 9x^2 + 54x +82 = 0 in simplest a + bi form?​
s344n2d4d5 [400]

Answer:

The roots are

<h3>x =  - 3 +  \frac{1}{3}  i \:  \:  \: or \:  \:  \: x =  - 3 -  \frac{1}{3} i \\</h3>

Step-by-step explanation:

9x² + 54x + 82 = 0

Using the quadratic formula

That's

<h3>x =  \frac{ - b\pm \sqrt{ {b}^{2}  - 4ac} }{2a}</h3>

From the question

a = 9 , b = 54 , c = 82

Substitute the values into the above formula and solve

That's

<h3>x =  \frac{ - 54\pm \sqrt{ {54}^{2}  - 4(9)(82)} }{2(9)}  \\ x =  \frac{ - 54\pm \sqrt{2916 - 2952} }{18}  \\ x =  \frac{ - 54\pm \sqrt{ - 36} }{18}  \\ x =  \frac{ - 54\pm 6i}{18}</h3>

Separate the real and imaginary parts

That's

<h3>x =  -  \frac{54}{18} \pm \frac{6}{18}  \: i \\ x =  - 3\pm \frac{1}{3} i</h3>

We have the final answer as

<h3>x =  - 3 +  \frac{1}{3}  i \:  \:  \: or \:  \:  \: x =  - 3 -  \frac{1}{3} i \\</h3>

Hope this helps you

5 0
3 years ago
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