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Sergeeva-Olga [200]
4 years ago
13

Solve for x. 2x2+4x−1=0 Enter your answers in the boxes.

Mathematics
2 answers:
Step2247 [10]4 years ago
7 0

2 \times 2 + 4x - 1 = 0 \\ 4 + 4x - 1 = 0 \\ 4x - 1 =  - 4 \\ 4x =  - 3 \\ x =  -  \frac{3}{4}
malfutka [58]4 years ago
6 0

Answer:

0.2247,-2.2247

Step-by-step explanation:

Equation : 2x^2+4x-1 =0

We are supposed to find the values of x .

General form of equation : ax^2+bx+c=0

Formula : x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}

a = 2

b = 4

c = -1

So, x=\frac{-4 \pm \sqrt{4^2-4(2)(-1)}}{2(2)}

x=0.2247,-2.2247

Hence the values of x are 0.2247,-2.2247

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A race car driver lost 8 seconds off the leader for each of the 3 pit stops the driver made. At each of the next 2 pit stops the
julsineya [31]

Answer:

-4 seconds

Step-by-step explanation:

The question says he lost 8 seconds off the leader for each of the 3 pit stops that he made

8 x 3 = 24

This means that 24 seconds was lost.

If 10 seconds were gained for the next 2 pit stops, the driver gained a total of

2 x 10 = 20seconds

The amount of time he is off leader =

20 -24

= -4 seconds

We have it that -4 seconds represents time he is off the leader.

Thank you!

5 0
4 years ago
Read 2 more answers
Simplify (4.5)(5)(-2).<br><br> answers:<br><br> 45<br><br> 4.5<br><br> -4.5<br><br> -45
Doss [256]

Answer:

-45

Step-by-step explanation:

(4.5)*5*(-2) = 4.5* (5*(-2)

                  = 4.5 * (-10)

                   = -45.0

                    = -45

5 0
3 years ago
Read 2 more answers
Determine whether the two expressions are equivalent.
Julli [10]

Answer:

They are equivalent because they equal the same, but the numbers are just flipped around. True

Step-by-step explanation:


8 0
3 years ago
Write 1.5% as a fraction
lutik1710 [3]
With percentages it is useful to know that cent is 100 in Latin. So think of percent as PER-100. So 1.5% is 1.5 per 100. i.e 1.5/100.

To avoid having a decimal as your numerator write it as 3/200
5 0
3 years ago
Classify the four angles of the quadrilateral. B 105° A .90° 75° C 90° D LA LB 4C ZD Right Acute Obtuse O X O O Ś ?
earnstyle [38]

The picture has a quadrilateral with ABCD angles.

∠A=90° is right angle

∠B=105° is obtuse angle

∠C=75° is acute angle

∠D=90° is right angle

Given that,

The picture has a quadrilateral with ABCD angles.

The angle are

∠A=90°

∠B=105°

∠C=75°

∠D=90°

We have to clarify the angles of the quadrilateral.

∠A is right angle because the right angle is created when two straight lines cross at a 90° angle or when they are perpendicular at the intersection.

∠B is obtuse angle because a form of angle known as an obtuse angle is one that is always greater than 90° but less than 180°.

∠C is acute angle because an acute angle is one that is smaller than 90 degrees in length. L-shape shapes at 90°

∠D is right angle because the right angle is created when two straight lines cross at a 90° angle or when they are perpendicular at the intersection.

To learn more about angle visit: brainly.com/question/28451077

#SPJ9

8 0
1 year ago
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