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4 years ago

Is the there whole numbers in -57

Mathematics

1 answer:

mestny [16]4 years ago

8 0

-57 is a whole number, yes (it does not have a decimal or fraction)

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Solve the equation 3x+x²=-7. Does the number of solutions match the information provided by the discriminant? Explain

MA_775_DIABLO [31]

Answer:

$-\frac{3}{2}+\frac{\sqrt{19}i}{2}$ and $-\frac{3}{2}-\frac{\sqrt{19}i}{2}$

Step-by-step explanation:

$3x+x^2=-7\\\Rightarrow x^2+3x+7=0$

Discriminant

$D=b^2-4ac\\\Rightarrow D=3^2-4\times 7\times 1\\\Rightarrow D=-19$

If the discriminant is a negative number then the roots of the equation are imaginary

$x=\frac{-b\pm \sqrtD}{2a}\\\Rightarrow x=\frac{-3\pm \sqrt{-19}}{2\times 1}\\\Rightarrow x=-\frac{3}{2}\pm \frac{\sqrt{19}i}{2}\\\Rightarrow x=-\frac{3}{2}+\frac{\sqrt{19}i}{2}, x=-\frac{3}{2}-\frac{\sqrt{19}i}{2}$

So, the two solutions are $-\frac{3}{2}+\frac{\sqrt{19}i}{2}$ and $-\frac{3}{2}-\frac{\sqrt{19}i}{2}$

3 0

3 years ago

The length of a rectangle is five times its width. The perimeter of the rectangle is at most 96 cm.

kupik [55]

answers B and D are clearly wrong and if u do some simple thinking you can determine the answer is C...

Have a fantabulous day! :)

5 0

3 years ago

Read 2 more answers

Calculate the pay for the following day of a weekly time card given a wage of $14.50/hr. Name Week of: SI Morning lo Out Monday

Vanyuwa [196]

As we can see in the card, on Monday the worker clocked in at 08:15 and clocked out at 12:15. This means they worked 4 hours.

They then clocked in at 13:00 and clocked out at 17:30. This means they worked for 4 and a half hours.

Since they earn a wage of $14.50/h, they earned:

$(4+4.5)\cdot14.50=8.5\cdot14.50=123.25.$

So that day they earned $123.25

7 0

1 year ago

Find the value of x.

Contact [7]

Answer:

x = 16

Step-by-step explanation:

First, find hypotenuse using 18 and 16.

Using Pythagorean theorem, it gives 24.08

now use it again with the hypotenuse and (36/2) = 18

This gives us x = 16

3 0

3 years ago

What is -(2×7)+(4g×9a)

kotykmax [81]

I think its 162 but i dont know so hope this helps sorry if it dont

4 0

4 years ago