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4 years ago

(x2 + 3x – 4) + (2x3 - 2x + 5)

Mathematics

2 answers:

seropon [69]4 years ago

7 0

Answer:

step-by-step.

x2+3x−4+2x3−2x+5

=x2+3x+−4+2x3+−2x+5

Combine Like Terms:

=x2+3x+−4+2x3+−2x+5

=(2x3)+(x2)+(3x+−2x)+(−4+5)

=2x3+x2+x+1

Answer:

=2x3+x2+x+1

rosijanka [135]4 years ago

7 0

Answer:

below

Step-by-step explanation:

$( x^{2} + 3x - 4) + ( 2x^{3} -2x = 5) \\x^{2} + 3x - 4 + 2x^{3} - 2x + 5 \\x^{2} + (3x-2x) + 2x^{3} + ( 5 - 4) \\ x^{2} + x + 2x^{3} + 1 \\ 2x^{3} + x^{2} + x + 1$

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I DONT KNOW THESE! HELP!

kkurt [141]

Answer:

20. x = 5, y = -2

21. x = 11, y = 12

22. x = 22, y = 11

23. x = 11, y = 10

Step-by-step explanation:

20. Opposite sides in the parallelogram are congruent, so

$2y+18=3x-1\\ \\6x-3=17-5y$

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$\left\{\begin{array}{l}2y-3x=-19\\ \\6x+5y=20\end{array}\right.$

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Substitute it into the first equation:

$2\cdot (-2)-3x=-19\\ \\-3x=-19+4\\ \\-3x=-15\\ \\x=5$

21. Opposite angles in the parallelogram are congruent, so

$11x+5=10y+6$

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$6x-y+11x+5=180^{\circ}$

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$\left\{\begin{array}{l}11x-10y=1\\ \\17x-y=175\end{array}\right.$

From the second equation

$y=17x-175$

Substitute it into the first equation:

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22. Opposite angles in the parallelogram are congruent, so

$2x-5=3y-12$

Consecutive angles are supplementary, so

$2x-5+7y+x=180^{\circ}$

Solve this system of two equations:

$\left\{\begin{array}{l}2x-3y=-7\\ \\3x+7y=185\end{array}\right.$

From the first equation

$x=-3.5+1.5y$

Substitute it into the second equation:

$3(-3.5+1.5y)+7y=185\\ \\-10.5+4.5y+7y=185\\ \\-105+45y+70y=1,850\\ \\115y=1,850+105\\ \\115y=1,955\\ \\y=17\\ \\x=-3.5+1.5\cdot 17=22$

23. Opposite sides in the parallelogram are congruent, so

$2x+9=4y-9\\ \\3x-5=2y+8$

Solve this system of two equations:

$\left\{\begin{array}{l}2x-4y=-18\\ \\3x-2y=13\end{array}\right.$

Multiply the second equation by 2 and subtract it from the first equation:

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Substitute it into the first equation:

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3 years ago

Alex simplified the expression 7+(3x 1.4)+5+2+(5x 14) to find the area of the figure on the grid.

Luden [163]

The error Alex made is that he found the perimeter of the figure instead of the area.

<h3>Area and perimeter of shapes</h3>

Given the expressions

7+(3x 1.4)+5+2+(5x 14)

He used the expression to simplify the grid

The expression simplified shows that Alex added all the measures of the sides of the grid instead of taking the product of the length and width

Note that the operation Alex performed is the perimeter of the figure instead of the area hence the error Alex made is that he found the perimeter of the figure instead of the area.

Learn more on area and perimeter of figure here: brainly.com/question/443376

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Which expression is equivalent to −2(3x + 5y)?

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(x2 + 3x – 4) + (2x3 - 2x + 5)​

(x2 + 3x – 4) + (2x3 - 2x + 5)