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dexar [7]
1 year ago
13

8x2 +43x +30=0solve for x

Mathematics
1 answer:
storchak [24]1 year ago
8 0

Use the quadratic formula to find the values of x:

x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}

Where a, b and c are the coefficients of the quadratic equation.

\begin{gathered} x=\frac{-43\pm\sqrt[]{43^2-4\cdot8\cdot30}}{2\cdot8} \\ x=\frac{-43\pm\sqrt[]{1849-960}}{16} \\ x=\frac{-43\pm\sqrt[]{889}}{16} \end{gathered}

The equation has two solutions for x.

\begin{gathered} x1=\frac{-43+\sqrt[]{889}}{16} \\ x2=\frac{-43-\sqrt[]{889}}{16} \end{gathered}

As decimal numbers:

\begin{gathered} x1=-0.8239 \\ x2=-4.5510 \end{gathered}

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If x represents a number, does 2/5 times x always represent 40% of that number?
marusya05 [52]

Answer:

Yes, it always represent 40% of that number.

Step-by-step explanation:

5 0
2 years ago
Anyone know what the answer is? I'd appreciate it if someone could help because im stuck
andrew-mc [135]

Answer:

100

Step-by-step explanation:

Isosceles triangle have 2 equal angles. Therefore the second angle in the triangle will also be 25.

Since the sum of angles in a triangle is 180.

180-(25x2) will give you the last angle in one of the triangles.

The other angle is identical so the angle at the top of the other triangle will also be 130.

The sum of angles in a circle is 360.

Therefore, angle x = 360-(130x2)

X= 100

7 0
3 years ago
Pleaseeeee help I’m begging someone I PROMISE. I will mark brainlest
Lerok [7]

Answer:


Step-by-step explanation:

a) x>0 → items can not be negative

b) c(2,000) = 5,000+1.3(2,000) = $7,600

c)5,000+1.3x<10,000

5,000-5,000+1.3x<10,000-5,000

1.3x<5,000

x<3846 items


5 0
3 years ago
My question got deleted so I'll post these into two separate
Agata [3.3K]

Answer:

see below

Step-by-step explanation:

1 million

1,000,000 seconds * 1 hour/ 3600 seconds * 1 day/ 24 hours * 1 year / 365 days

.031709792 years

Rounding to 3 decimal places

.032 years

50 years * 365 days/ 1 year * 24 hours/ 1 day * 3600 second / 1 hour    

1577000000 seconds    

46 inches * 1 ft/ 12 inches *  1 mile/5280 ft

0.000726 miles

8 0
3 years ago
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tigry1 [53]

Answer:

X=7 and y is y=40 length is 47

Step-by-step explanation:

3 0
3 years ago
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