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sveta [45]
3 years ago
7

Someone pretty pls help me

Mathematics
1 answer:
nalin [4]3 years ago
3 0
What grade is that???
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how do you simplify the expression 3 root 7 over -1- root 27? please explain with details. does multiplying by conjugates work i
kap26 [50]

as you already know we'll be using the conjugate of -1-√(27), which is just -1 + √(27), so we can rationalize the denominator.


\bf \cfrac{3\sqrt{7}}{-1-\sqrt{27}}\cdot \cfrac{-1+\sqrt{27}}{-1+\sqrt{27}}\implies \cfrac{3\sqrt{7}(-1+\sqrt{27})}{\stackrel{\textit{difference of squares}}{(-1)^2-(\sqrt{27})^2}}\implies \cfrac{-3\sqrt{7}+3\sqrt{189}}{1-27} \\\\\\ \begin{cases} 189=3\cdot 3\cdot 3\cdot 7\\ \qquad 3^2\cdot 21 \end{cases}\implies \cfrac{-3\sqrt{7}+3\sqrt{3^2\cdot 21}}{-26} \\\\\\ \cfrac{-3\sqrt{7}+9\sqrt{21}}{-26}\implies \cfrac{3\sqrt{7}-9\sqrt{21}}{26}

5 0
3 years ago
Tom is planning a circular flower garden for the art. What area of the yard will be planted with flowers?
laila [671]
The circular part will be planted
3 0
4 years ago
Find the mean of, -21,-24,-37,-52,-56
Marta_Voda [28]

Answer:

-38

Step-by-step explanation:

(-21 + -24 + -37 + -52 + - 56)/5 = -38

8 0
3 years ago
You bought a magazine for 3 and some candy bars for 2 each. You spent a total of 19. How many candy bars did you buy?
MAVERICK [17]

Answer:

8 CANDY BARS

Step-by-step explanation

8 0
4 years ago
Read 2 more answers
Simplify 2 a + 4 - 7 a + a
AlexFokin [52]
2a + 4 - 7a + a

2a -7a +a +4

-5a + a +4

-4a + 4

-4a + 4 is your answer

hope this helps
8 0
4 years ago
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