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Solving for x, (x-1)²=8

Pls help solve for x

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Taking underroot on both side we get
x-1=2*1.414
x=2.828+1
x=3.828

Posted on Dec 11, 2008

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Use the identity tan(x/2)=sinx/1+cosx to solve for the value of tan45 degrees


tan(x/2)=sin(x)/(1+cos(x))
Setting x/2=45, means that x=90 (degrees)
But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

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Solve:6sqrt y + 6y to the negative 1/2 power =37


let sqrt of y =x

y to the power negative 1/2 = 1/ sqrt y

so our equation becomes

( 6x + 1 / 6x ) = 37

36x^2 -222 x + 1 =0

the roots of above quadratic equation are

x1=6.1621

and x2 =.0045

therefore y = x^2

y = 6.1621^2 = 37.971

and y=.0045^2 = .00002025

pls rate the solution if it was helpful.post your doubts i f u have any


Apr 21, 2010 | SoftMath Algebrator - Algebra Homework...

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Solve g(x)=-x


Simplifying
g(x) = -1x

Multiply g * x
gx = -1x

Solving
gx = -1x

Solving for variable 'g'.

Move all terms containing g to the left, all other terms to the right.

Divide each side by 'x'.
g = -1

Simplifying
g = -1

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Sin x cos x = -1/2 solve for x


sin x cos x = -1/2
=> 2sinx cosx = -1
=> sin(2x) = -1
=> 2x = (3pi)/2 OR 2x = 270°
=> x = 3pi/4 OR x = 135°



Jan 04, 2010 | SoftMath Algebrator - Algebra Homework...

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Help please


Volume 1 x .4 + Volume 2 x .75 = 70 mL x .5

Volume 2 = 70 - Volume 1

V1 x .4 + (70-V1) x .75 = 70 mL x .5

solve for V1

Sep 30, 2009 | SoftMath Algebrator - Algebra Homework...

1 Answer

Pls solve this question


Mass of 18 is 80; Mass of 12 is 40.
Solution is
1) M18+M12=M16, given as 120
2) Mg16=16.24x120=80
3).75M18+.5M12=80
(mult by -2)
4)-1.5M18-m12=-160
(adding 1 and 4)
5)-.5M18=-40
6) M18=80
(substituting into 1)
7) M12=40

Jun 18, 2009 | Computers & Internet

3 Answers

Solving systems of equations by elimination


Hi joanmae jmeh;

You can add these equations just like you would numbers

3x + 2y = 7
5x - 2y = 1
-----------------------
8x =8
x=1
Now plug x = 1 back into either equation and you can solve for y
Y = 2

When you add the 2 equations together the +2y and the -2y cancel
out

Hope this helps Loringh Please leave a rating for me Thks

Dec 01, 2008 | Bagatrix Algebra Solved! 2005 (105101) for...

1 Answer

-4(x-2) 3(-4-x) Who Do you solve this?


Hi blackeyedbab:

Something is missing here. In order to "solve" this, there has to be an equal sign somewhere.

My educated guess is:

#1 -4(x-2) = 3(-4-x) in which case the solution is (removing parentheses)
-4x + 8 = -12 - 3x or -x = -20 or x = 20

Hope this helps... Loringh PS Please leave a rating if appropriate Thks

Nov 20, 2008 | The Learning Company Achieve! Math &...

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