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3 years ago

Calcule 2x² - x + 3 para os seguintes valores de x:

Mathematics

1 answer:

sattari [20]3 years ago

7 0

B is the correct answer

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PLZZZ HELP<br><br>Order these numbers from least to greatest.

Tomtit [17]

Answer:

51/10, 4 and 1/9, 5.116, and 5.98

Step-by-step explanation:

least to greatest

4 0

2 years ago

Read 2 more answers

Solve 2x2 + 20x = −38. (1 point)

RoseWind [281]

Answer:

The solutions are $x=-5+\sqrt{6}$ and $x=-5-\sqrt{6}$

Step-by-step explanation:

we have

$2x^{2} +20x=-38$

Divide by $2$ both sides

$x^{2} +10x=-19$ ------> $x^{2} +10x+19=0$

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2} +10x+19=0$

$a=1\\b=10\\c=19$

substitute

$x=\frac{-10(+/-)\sqrt{10^{2}-4(1)(19)}}{2(1)}$

$x=\frac{-10(+/-)\sqrt{100-76}}{2}$

$x=\frac{-10(+/-)\sqrt{24}}{2}$

$x=\frac{-10(+/-)2\sqrt{6}}{2}$

$x1=\frac{-10(+)2\sqrt{6}}{2}=-5+\sqrt{6}$

$x2=\frac{-10(-)2\sqrt{6}}{2}=-5-\sqrt{6}$

8 0

3 years ago

Read 2 more answers

Define least common multiple

AlexFokin [52]

Answer:

the smallest common multiple of two or more numbers

Step-by-step explanation:

6 0

3 years ago

The area of a rectangle with width × and length 7× is 7². what does the coefficient 7 mean in terms of the problem?

tatuchka [14]

The coefficient 7 means that the length is 7 times the width

<h3>How to interpret the coefficient?</h3>

The given parameters are:

Width = x

Length = 7x

Area = 7x^2

We have:

Length = 7x

Substitute Width = x in Length = 7x

Length = 7 * Width

This means that the length is 7 times the width