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Fynjy0 [20]
3 years ago
11

7. Evaluate this expression if x=-2* 3x2 - 4x

Mathematics
1 answer:
natali 33 [55]3 years ago
8 0

Answer: x=0 or x= -5/6

Step-by-step explanation: x=((−2)(3))(x2)−4x

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What are the roots of 3x2 + 10 = 4x?
sveticcg [70]

Answer:

Option C is correct.

roots of the given equation , x =\frac{2\pm i\sqrt{26}}{3}

Step-by-step explanation:

Given the equation: 3x^2+10 = 4x

We can write this equation as:

3x^2-4x + 10 =0

A quadratic equation is in the form of ax^2+bx+c =0      ......[1] where a,b ,c are the coefficient and x is the variable,

the solution of the equation is given by;

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

On comparing given equation with equation [1] we get;

a = 3 , b = -4 and c =10

So, the solution of the given equation is given by;

x = \frac{-(-4)\pm\sqrt{(-4)^2-4(3)(10)}}{2(3)}

or

x =  \frac{4\pm\sqrt{(16-120}}{6} = \frac{4\pm\sqrt{(-104)}}{6} = \frac{4\pm\sqrt{(-4 \times 26)}}{6}

or

x =\frac{4\pm2 \sqrt{(-26)}}{6} = \frac{4\pm2 i\sqrt{26}}{6}    [∴\sqrt{-1} = i

Simplify:

x =\frac{2\pm i\sqrt{26}}{3}

therefore, the roots of the given equation are; x =\frac{2\pm i\sqrt{26}}{3}

5 0
3 years ago
Read 2 more answers
Please help!
Sergio039 [100]

Answer:

The answer could be 0 or 1 out of 4, because choosing a card at first and not putting it back, then picking a second card at random, it would likely be one in zero attempts to pick 3 again but otherwise that it could be 1 out of 4 because it could be possible picking 3 at the first try.

3 0
3 years ago
What is the vertex of this parabola? y= 4(x + 1)2 - 6 0 (-1,-6) 0 (-6, -1) o 11,-6) 0 (-6, 1)​
Mandarinka [93]

Answer:

e

Step-by-step explanation:

7 0
3 years ago
A drama teacher has a budget of $120 to spend on materials to create costumes for a play. She can buy 1 square yard of white mat
Neporo4naja [7]

Inequalities are used to relate unequal expressions

The greatest whole number of square yards the teacher can buy is 4

The inequality is given as:

8x + 10y \le 120

When the <em>number of square yards </em>of the white fabrics is 10.

It means that: x = 10

So, we have:

8 \times 10 + 10y \le 120

80 + 10y \le 120

Collect like terms

10y \le 120 - 80

10y \le 40

Divide both sides by 10

y \le 4

The above inequality means that:

The greatest whole number of square yards the teacher can buy is 4

Read more about inequalities at:

brainly.com/question/15137133

4 0
3 years ago
If y = -12 when x = 9, find y when x = -4
Oksanka [162]
Set it up like this: \frac{9}{-12} =  \frac{-4}{y}. Then you would cross multiply which would result in: 9y=48. Divide by 9 on both sides and y=5.33333333.
7 0
3 years ago
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