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OlgaM077 [116]
3 years ago
12

Solve for x. 3x ^2 -4 = 8

Mathematics
2 answers:
LenKa [72]3 years ago
5 0

Answer:

x = ±2

Step-by-step explanation:

3x ^2 -4 = 8

Add 4 to each side

3x ^2 -4+4 = 8+4

3x^2 =12

Divide each side by 3

3x^2 =12

3x^2/3 = 12/3

x^2 = 4

Take the square root of each side

sqrt(x^2) = ±sqrt(4)

x = ±2

hodyreva [135]3 years ago
4 0

Answer:

x = 2

Step-by-step explanation:

3x ^2 -4 = 8

+4

3x^2 = 12

3x^2/3 = 12/3

x^2 = 4

Square root 4 is 2

x = 2

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What is the most convenient method to solve the quadratic equation ( x + 4 )² = 15
IgorC [24]

Answer:

Factoring

Step-by-step explanation:

(x+4)² = 15

x² + 8x + 16 = 15

x² + 8x + 1 = 0

x =  \frac{ - 8 +  \sqrt{64 - 4} }{2}  =  - 4 +  \sqrt{15}  \\  \\ x =  \frac{ - 8 -  \sqrt{64 - 4} }{2}  =  - 4 -  \sqrt{15}

I hope this helps you :)

7 0
2 years ago
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astra-53 [7]

Answer:

348

Step-by-step explanation:

Length-l

Width-w  

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A=2(wl+hl+hw)=2·(8·9+6·9+6·8)=348

3 0
3 years ago
Kid need help with homework 2 (8+×)=22
Masja [62]
X=3
22 \div 2 = 11
8 + 3 = 11

Step By Step:

find x

8 + ? • 2 = 22

22 ÷ 2 = 11

There for x = 3

8 + 3 = 11.
4 0
2 years ago
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Eva is at a sushi restaurant. She ordered 2 pieces of squid for a total of $3.50, 1 piece of eel for $3.25, 3 pieces of tuna for
earnstyle [38]
2 pieces of squid = $3.50 
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1 piece of eel = $3.25

3 pieces of tuna = $6.75
Therefore 1 piece of tuna = $2.25 (6.75÷3)

4 pieces of crab = $8.00 
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Put them in order of price and you get 

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What is the greatest common factor of the numerator of ?
Annette [7]

The greatest common factor of the numerator and denominator of the rational expression is x - 4

<h3>How to determine the greatest common factor?</h3>

The fraction expression is given as:

\frac{5x-20}{x^2-2x-8}

Factorize the numerator and the denominator

\frac{5x-20}{x^2-2x-8} = \frac{5(x-4)}{(x- 4)(x + 2)}

Cancel out the common factor

\frac{5x-20}{x^2-2x-8} = \frac{5}{(x + 2)}

The common factor that was canceled out is x - 4

Hence, the greatest common factor of the numerator and denominator of the rational expression is x - 4

Read more about greatest common factors at:

brainly.com/question/10076354

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