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3 years ago

Order of operations : 6+5-3x2+1-4:2=

Mathematics

2 answers:

Alexeev081 [22]3 years ago

8 0

3x2 is first then finish the equation like normal from the beginning to end!

Basile [38]3 years ago

8 0

You use
Parentheses
Exponent
Multiplication
Division
Addition
Subtraction
So you’ll read from left to right whatever come first and go down the list of PEMDAS
So the first thing you’ll do is 3x2 which is 6
So you should have 6+5-6+1-4/2 then do 4/2 which is 2 so you’ll have 6+5-6+1-2 next is addition so 6+5 is 11 now bring down the equation it’s 11-6+1-2 next do 11-6 it’s 5 so then it’ll be 5+1-2. 5+1 is 6 finally do 6-2 and that’s 4 so 4 is ur final answer

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Rewrite each expression by completing the square.

Lyrx [107]

Answer:

1) $x^2 -4x +(\frac{4}{2})^2 -\frac{5}{2} - (\frac{4}{2})^2$

$(x-2)^2 -\frac{5}{2} -4=(x-2)^2 -\frac{13}{2}$

2) $x^2 -3x +(\frac{3}{2})^2 +\frac{1}{2} - (\frac{3}{2})^2$

$(x-\frac{3}{2})^2 +\frac{1}{2} -\frac{9}{4}=(x-\frac{3}{2})^2 -\frac{7}{4}$

3) $x^2 +\frac{9}{2}x +(\frac{9}{4})^2 -\frac{15}{4} - (\frac{9}{4})^2$

$(x+\frac{9}{4})^2 -\frac{15}{4} -\frac{81}{16}=(x+\frac{9}{4})^2 -\frac{141}{16}$

4) $c^2 -\frac{5}{4}c +(\frac{5}{8})^2 -\frac{139}{200} - (\frac{5}{8})^2$

$(c-\frac{5}{8})^2 -\frac{139}{200} -\frac{25}{64}=(c-\frac{5}{8})^2 -\frac{1737}{1600}$

5) $n^2 +\frac{1}{4}n +(\frac{1}{8})^2 +\frac{5}{8} - (\frac{1}{8})^2$

$(n+\frac{1}{8})^2 +\frac{5}{8} -\frac{1}{64}=(n+\frac{1}{8})^2 +\frac{39}{64}$

Step-by-step explanation:

1. −2x^2 + 8x + 5

For this case we can begin dividing all the terms by -2 and we got:

$x^2 -4x -\frac{5}{2}[/texAnd if we complete the square we got:[tex] x^2 -4x +(\frac{4}{2})^2 -\frac{5}{2} - (\frac{4}{2})^2$

$(x-2)^2 -\frac{5}{2} -4=(x-2)^2 -\frac{13}{2}$

2. 2.5x^2 − 7.5x + 1.25

For this case we can begin dividing all the terms by 2.5 and we got:

$x^2 -3x + \frac{1}{2}$

And if we complete the square we got:

$x^2 -3x +(\frac{3}{2})^2 +\frac{1}{2} - (\frac{3}{2})^2$

$(x-\frac{3}{2})^2 +\frac{1}{2} -\frac{9}{4}=(x-\frac{3}{2})^2 -\frac{7}{4}$

3. 4 / 3x ^2 + 6x − 5

For this case we can begin dividing all the terms by 4/3 and we got:

$x^2 + \frac{9}{2}x - \frac{15}{4}$

And if we complete the square we got:

$x^2 +\frac{9}{2}x +(\frac{9}{4})^2 -\frac{15}{4} - (\frac{9}{4})^2$

$(x+\frac{9}{4})^2 -\frac{15}{4} -\frac{81}{16}=(x+\frac{9}{4})^2 -\frac{141}{16}$

4. 1000c^2 − 1250c + 695

For this case we can begin dividing all the terms by 1000 and we got:

$c^2 - \frac{5}{4}c + \frac{139}{200}$

And if we complete the square we got:

$c^2 -\frac{5}{4}c +(\frac{5}{8})^2 +\frac{139}{200} - (\frac{5}{8})^2$

$(c-\frac{5}{8})^2 -\frac{139}{200} -\frac{25}{64}=(c-\frac{5}{8})^2 -\frac{487}{1600}$

5. 8n^2 + 2n + 5

For this case we can begin dividing all the terms by 8 and we got:

$n^2 + \frac{1}{4}x + \frac{5}{8}$

And if we complete the square we got:

$n^2 +\frac{1}{4}n +(\frac{1}{8})^2 +\frac{5}{8} - (\frac{1}{8})^2$

$(n+\frac{1}{8})^2 +\frac{5}{8} -\frac{1}{64}=(n+\frac{1}{8})^2 +\frac{39}{64}$

3 0

3 years ago

What are the solutions to x2 - 2x -8=0?

pav-90 [236]

The answer is 2
Add like terms
Add 8 to -8 and the zero
To get 4x=8
Then divide 4 and 8 by 4
To get x=2

4 0

4 years ago

What is an equation that goes through the point (-7, 10) and is perpendicular to the line -2x-4y=9

algol13

Step-by-step explanation:

m1.m2= -1

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-1/2.m2= -1

m2 = 2

formula = y - y1 = m2 ( x - x1)

y - 10 = 2 ( x - (-7))

y - 10 = 2x + 14

y = 2x + 24

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3 years ago

Testing to see if there is evidence that the correlation between two variables is negative.

svp [43]

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3 years ago

How do I verify this?

Mashcka [7]

Answer:

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=1-sinθ/sinθ+1

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3 years ago