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3 years ago

Question 5 of 23 Simplify the expression. –x(6x – 7) A. –6x2 + 7x B. 5x2 – 6x C. 6x + 7x D. –6x – 7x

Mathematics

1 answer:

Zarrin [17]3 years ago

5 0

Answer:

I'm not sure about the options

Step-by-step explanation:

but this is the answer when we simplify

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docker41 [41]

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14] two drivers, starting at the same place, begin driving in opposite directions at the same time. one heads east at 65 kilomet

Juliette [100K]

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3 years ago

Ann prefers ice cream cups. Ben and Clay prefer ice cream sandwiches. The cafeteria manager puts one coupon for an ice cream cup

son4ous [18]

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3 years ago

What are all of the real roots of the following polynomial? f(x) = x^4 -24x^2 - 25 A. -1 or 1 B. -5 or 5 C. -5, -1, 1, or 5 D. -

professor190 [17]

For this case we have the following function:

$f (x) = x ^ 4-24x ^ 2-25$

We make a change of variable:

$u = x ^ 2$

So, we have:

$u ^ 2-24u-25$

We apply the resolver:

$a = 1\\b = -24\\c = -25\\$

$u = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2 (a)}\\u = \frac {- (- 24) \pm \sqrt {(- 24) ^ 2-4 (1) (- 25)}} {2 (1)}\\u = \frac {24 \pm \sqrt {576 + 100}} {2}\\u = \frac {24 \pm \sqrt {676}} {2}\\u = \frac {24\pm26} {2}$

We have two roots:

$u_ {1} = \frac {24 + 26} {2} = 25\\u_ {2} = \frac {24-26} {2} = - 1$

Returning the change:

$x ^ 2 = 25\\x = \pm \sqrt {25} = \pm5$

$x ^ 2 = -1$ Give the imaginary roots.

Answer:

Real roots $\pm5$

5 0

3 years ago

The price of 10 citrons and 7 fragrant wood apples is 55 units. The price of 7 citrons and 10 fragrant wood apples is 64 units.

a_sh-v [17]

Price of one citron = 5 units

Price of one fragrant = 5/7 units = 0.71 units

Further explanation:

Let x be the price of one citron and

y be the price of one fragrant

Then according to given statement

10x+7y = 55 Eqn 1

7x+10y = 64 Eqn 2

Multiplying equation 1 by 7

$7(10x+7y) = 7(55)\\70x+49y=385$

This will be equation 3.

Multiplying equation 2 by 10

$10(7x+10y) = 10(64)\\70x+100y=640$

This will be equation 4.

Subtracting equation 3 from equation 4

$70x+100y - (70x+49y) = 640-385\\70x+100y-70y-49y = 255\\51y = 255\\\frac{51x}{51} = \frac{255}{51}\\x = 5\\Putting\ x=5\ in\ equation\ 1\\10(5)+7y = 55\\50+7y = 55\\7y = 55-50\\7y = 5\\\frac{7y}{7} =\frac{5}{7}$

So,

Price of one citron = 5 units

Price of one fragrant = 5/7 units = 0.71 units

Keywords: Linear Equations, Solving system of linear equations

Learn more about linear equations at:

#LearnwithBrainly

5 0

3 years ago