3 years ago

Which number line best represents - 2.6?

Mathematics

1 answer:

sattari [20]3 years ago

5 0

B! Is the answer ur welcome :)

You might be interested in

Let u and v be the solutions to 3x^2 + 5x + 7 = 0. Find u/v+v/u

Hitman42 [59]

Answer: $\dfrac{-17}{21}$

Step-by-step explanation:

Given: u and v be are the solutions of $3x^2+5x+7=0$

Let $ax^2+bx+c=0$ is the quadratic equation and u and v are the zeroes/solutions then

Sum of zeroes; $u+v = \dfrac{-b}{a}$

Product of zeroes; $uv= \dfrac{c}{a}$

Comparing $3x^2+5x+7=0$ to $ax^2+bx+c=0$

we get a= 3 , b= 5 and c = 7

$u+v = \dfrac{-b}{a} = \dfrac{-5}{3}----(i)$

$uv= \dfrac{c}{a} = \dfrac{7}{3}----(ii)$

Now we have to find

$\dfrac{u}{v} +\dfrac{v}{u} =\dfrac{u^2+v^2}{uv}$ adding and subtracting 2uv in numerator we get

$= \dfrac{u^2+v^2+2uv-2uv}{uv}= \dfrac{(u+v)^2-2uv}{uv}$

Substituting the values from (i) and (ii) we get

$\dfrac{(\dfrac{-5}{3} )^2-2\times \dfrac{7}{3} }{\dfrac{7}{3} } = \dfrac{\dfrac{25}{9} -\dfrac{14}{3} }{\dfrac{7}{3} }= \dfrac{\dfrac{25-42}{9} }{\dfrac{7}{3}} =\dfrac{-17}{9} \times \dfrac{3}{7} = \dfrac{-17}{21}$

Hence, the value of $\dfrac{u}{v} +\dfrac{v}{u}$ is $\dfrac{-17}{21}$

5 0

4 years ago

Help pls dont answer if you don’t know also ill give brainliest

evablogger [386]

Answer:

6x + 1

Step-by-step explanation:

Distribute

3 + 2 ( x- 1 ) + 4x

3 + 2x - 2 + 4x

Subtract

3 + 2x - 2 + 4x

1 + 2x + 4x

Like terms

1 + 2x + 4x

1 + 6x

Rearrange

6x + 1

5 0

3 years ago

Read 2 more answers

Find f(4) when f(x) = 5x^2 - 5x + 7. A) 107 B) 53 C) 67 D) 3

fgiga [73]

I think the answer is 67

5 0

4 years ago

A quadratic equation of the form 0 = ax2 + bx + c has a discriminant value of –16. How many real number solutions does the equat

Sunny_sXe [5.5K]

So because the discriminant is less than zero so this mean that the quadratic has no real solutions

6 0

3 years ago

Read 2 more answers

51.33333333 just round it plz

ankoles [38]

Answer:

Step-by-step explanation:

The answer would be 51 because the numbers behind the decimal are below 5

6 0

3 years ago

Read 2 more answers