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3 years ago

Find the sum (−5x2+4x−2)+(−8x2+2x+1)

Mathematics

2 answers:

vredina [299]3 years ago

3 0

Answer:

3 $x^{2}$ + 6x - 1

Step-by-step explanation:

(-5 $x^{2}$ + 4x - 2) + ( 8 $x^{2}$ + 2x + 1)

1.Remove parenthesis

-5 $x^{2}$ + 4x - 2 + 8 $x^{2}$ + 2x + 1

2. Combine like terms

3 $x^{2}$ + 6x - 1

tatuchka [14]3 years ago

3 0

Answer:

I believe that he answer is -8x squared -x +3.

Step-by-step explanation:

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What is the approximate area of the figure? A. 947.8 square feet B. 194.2 square feet C. 345.0 square feet D. 244.5 square feet

Nesterboy [21]

So you do 18 x 8 to get the area of the rectangle bit. (18 x 8 = 144)
Then you can put the two half circles together to make a full circle. Area of a circle is
pi x radius x radius

so the radius would be half of the diameter (8/2 = 4)
so area would be:
Pi(equal to around 3.14) x 4 x 4 = 50.2
then you add the areas of the rectangle and circle
144 + 50.2 = 194.2

8 0

3 years ago

Figure LMNO is a parallelogram. Parallelogram L M N O is shown. Angle M is (3 x) degrees and angle N is (8 x minus 40) degrees.

saw5 [17]

Answer:

Step-by-step explanation:

we know that

In a parallelogram, opposite angles are congruent and consecutive angles are supplementary

In this problem

M and N are consecutive angles so

$m\angle M+m\angle N=180^o$

substitute the given values

$3x^o+(8x-40)^o=180^o$

solve for x

$11x-40=180\\11x=220\\x=20$

5 0

3 years ago

Read 2 more answers

Triangle ABC has vertices A (3,-3) B (-7,9) C (-11,3). Determine the point of intersection of the medians, and state the coordin

emmainna [20.7K]

Answer:

(-5, 3)

Step-by-step explanation:

Let O(x, y) be the centroid of the triangle.

The median of a triangle is a line segment that joins the vertex of a triangle to the midpoint of the opposite side. There are three medians in a triangle; and the medians of a triangle intersect at a point called the centroid.

The centroid of a triangle is gotten from the average of the x coordinates and the y coordinates of all the three vertices.

For Triangle ABC has vertices A (3,-3) B (-7,9) C (-11,3) and centroid O(x, y). Hence:

$x=\frac{3 + (-7)+(-11)}{3}=-5\\\\y=\frac{-3 + 9 + 3}{3} =3$

The centroid is at (-5, 3)

5 0

3 years ago

Please help me i'd really appreciate any help

garik1379 [7]

Congruent means they are the same length.

Set both lines equal to each other and solve for x:

x + 5 = 2x -10

Subtract x from both sides:

5 = x -10

Add 10 to both sides:

x = 15

Now you have a value for x, replace x in the equation of the line and solve:

QR = x +5 = 15 +5 = 20

8 0

3 years ago

The sum of two positive numbers is 16 and their difference is 2 . the larger number is?

Aleonysh [2.5K]

Answer:

Step-by-step explanation:

7 + 9 = 16

9 - 7 = 2

The larger number is 9

Hope that helps!

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3 years ago

Read 2 more answers