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vova2212 [387]
4 years ago
12

4(x − 4) + 2(3x2 + 3x − 20)

Mathematics
1 answer:
Feliz [49]4 years ago
7 0

Answer:

10x-56 + 6x^{2}

Step-by-step explanation:

Step 1: 4x-16+2(3x^{2} +3x-20)

Step 2: 4x-16+6x^{2} +6x-40

Step 3: (4x+6x) + (-16-40) +6x^{2}

Step 4: 10x - 56 + 6x^{2}

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Solve the following quadratic equation using the quadratic formula.
sdas [7]
ax^2+bx+c=0\\\\\Delta=b^2-4ac\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}

<span>5x^2-8x+5=0\to a=5;\ b=-8;\ c=5\\\\\Delta=(-8)^2-4\cdot5\cdot5=64-100=-36\\\\\sqrt\Delta=\sqrt{-36}=6i

x_1=\dfrac{-(-8)-6i}{2\cdot5}=\dfrac{8-6i}{10}=\dfrac{4-3i}{5}\\\\x_2=\dfrac{-(-8)+6i}{2\cdot5}=\dfrac{8+6i}{10}=\dfrac{4+3i}{5}
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6 0
4 years ago
Read 2 more answers
Find the sum or difference <br> 31/4+42/4=
Alex73 [517]

The sum of 31/4+42/4= 18.25

<u>Step-by-step explanation</u>:

  • The denominators are same.
  • Then add the numerators and keep the denominators same.

The sum of (31/4) + (42/4) = (31+42)/4

⇒ 73/4

⇒ 18.25

8 0
3 years ago
How many degrees does a minute hand of a clock turn through from 6:20 am to8:00 am on the same day ? A. 680 degrees B. 600 degre
Phoenix [80]

Answer:

B 600

Step-by-step explanation:

A clock is a circle with 12 equal sectors. A circle has 360 degrees so every time a minute hand number goes to another number it changes 30 degrees. After a full hour the time is 7 20 and it changes 360 degrees since the minute hand change over time was 12. 30x12=360.

Then it from 7 :20 and 8 00 the change 8 so is 30×8=240

360+240=600

3 0
3 years ago
If lim x-&gt; 4 f(x)=5 lim x-&gt; 4 f g(x)=0 and lim x-&gt; 4 f h(x)=-2, then find lim (fg)(x)
Lyrx [107]

Answer:

0

Step-by-step explanation:

Assuming the problem is:

"lim x-> 4 f(x)=5 lim x-> 4 g(x)=0 and lim x-> 4 h(x)=-2, then find lim x->4 (fg)(x)"

lim x->4 (fg)(x)

Since we know the limits of f and g at x=4 exist we can write the limit as:

lim x->4 f(x) lim x->4 g(x) (since fg(x) means f times g of x.)

5(0)

0

5 0
3 years ago
Anne runs 6 laps on a track. She runs a total of 1 mile or 5,280 feet. Write and solve an equation to find the distance, in feet
attashe74 [19]
You could use the equation: 5,280/6= 880
6 0
3 years ago
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