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4 years ago

If 2a+ 2/a =4, what is the value of 2a^2− 2/a^2 ?

Mathematics

2 answers:

GuDViN [60]4 years ago

8 0

Here is a step-by-step process to solve this problem.

TiliK225 [7]4 years ago

4 0

Answer:

2a² - $\frac{2}{a^2}$ = 0

Step-by-step explanation:

If 2a + 2/a = 4

Multiplying by a throughout to get:

2a² + 2 = 4a

Making this a quadratic equation:

2a² - 4a + 2 = 0

Dividing by 2 throughout:

a² - 2a + 1 = 0

Applying the quadratic formula:

a = $\frac{2 +/- 0}{2}$

a = 1

2a² - $\frac{2}{a^2}$ = 2 - 2 = 0

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Step-by-step explanation:

she took the 2X and substract 4X-2X

the answer will be 2X=402

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3 years ago

What is formula of sec(A+B)

Natasha2012 [34]

Answer:

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Step-by-step explanation:

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4 years ago

Please help: 12x^4(-5/6x^3y^2) If possible, include steps Thanks.

tangare [24]

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Question
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$12x^4(- \frac{5}{6} x^3y^2)$

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Multiply the constant: 12 x (-5/6)
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$-10x^4( x^3y^2)$

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Multiply the x (we add the power together when we multiply)
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$-10x^7y^2$

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Answer: -10x⁷y²
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4 0

3 years ago

Can somebody teach me inscribed angles! My 40 question summarize on circles in geometry is today and I need help on everything!

deff fn [24]

Inscribed angles are pretty easy, they're always half the corresponding central angle. The arc measure are always of central angles.

1. We're told to arc is 62 degrees so the inscribed angle is half,

WXY = 31 degrees.

2. Here we're told the inscribed angle is 113 degrees so the arc is double,

DGF=226 degrees

3. Angles which subtend a diameter are always right angles.

PQR = 90 degrees

4. If we draw DC we see it's a radius too, so DC=DB and we have an isosceles triangle so DCB=47 degrees so BDC=180-47-47=86. The central angle is the arc measure so

BC=86 degrees

5. Angle JNK=53 degrees and angles NJK=NKJ because we have an isosceles triangle, two sides radii. So NKJ=(180-53)/2.

Similarly NKL=(180-65)/2

So angle JKL=NKJ+NKL=180 - (65+53)/2 = 180 - 118/2 = 121 degrees

I better leave the rest for you.

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3 years ago

Which expression is equivalent to (3x+4)(7x-2)

Cerrena [4.2K]

Answer:

21x² + 22x - 8

Step-by-step explanation:

(3x+4)(7x-2) = 21x² - 6x + 28x - 8 = 21x² + 22x - 8

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3 years ago

Read 2 more answers