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3 years ago

Add: 2x² - 8x -9 and 3 x² + 8x-2

Mathematics

2 answers:

Delvig [45]3 years ago

6 0

Answer:

Step-by-step explanation:

We got to add these together so

2x^2-8x-9+3x^2+8x-2

the 2x^2 and 3x^2 add to 5x^2

the 8x and -8x cancel each other out

the -9 and -2 add to -11

so..

5x^2 - 11

I hope this helped :)

krek1111 [17]3 years ago

5 0

Answer:

5x²-11

Step-by-step explanation:

2x²-8x-9+3x²+8x-2

2x²+3x²-8x+8x-9-2

5x²-11

hope it helps you

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irga5000 [103]

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3 years ago

If one kilogram is 2.2 pounds how many kilograms would it make for 11 pounds

Mila [183]

Answer:

5 kg

Step-by-step explanation:

To solve this problem, we can use the rule of three.

In fact, we know that:

- 1 kilogram is equivalent to 2.2 pounds

- The ratio between the mass in kilograms and in pounds is constant for every value of the mass

- Therefore, the mass in kilograms corresponding to 11 pounds can be found by writing the following equation:

$\frac{1 kg}{2.2 p}=\frac{x}{11 p}$

Where

x is the mass in kilograms corresponding to 11 pounds.

Solving the equation for x, we find:

$x=\frac{(11p)(1kg)}{2.2p}=5 kg$

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3 years ago

A 10-foot ladder is leaning against a tree. The bottom of the ladder is 4 feet away from the bottom

Naddik [55]

Answer:

Step-by-step explanation:

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3 years ago

Please help me with this question. image attached.

Alona [7]

Answer:

Answer: A as you have indicated.

Step-by-step explanation:

Givens

There are two sides that are 3.1 cm in length
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where b is the base and
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3 years ago

If using the method of completing the square to solve the quadratic equation x^2-10x-13=0, which number would have to be added t

Maru [420]

Answer: The solution to the problem is based on the solutions

from the subproblems.

x = {8.464101615, 1.535898385}

Step-by-step explanation:

x^2-10x+13=0

Simplifying

x2 + -10x + 13 = 0

Reorder the terms:

13 + -10x + x2 = 0

Solving

13 + -10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-13' to each side of the equation.

13 + -10x + -13 + x2 = 0 + -13

Reorder the terms:

13 + -13 + -10x + x2 = 0 + -13

Combine like terms: 13 + -13 = 0

0 + -10x + x2 = 0 + -13

-10x + x2 = 0 + -13

Combine like terms: 0 + -13 = -13

-10x + x2 = -13

The x term is -10x. Take half its coefficient (-5).

Square it (25) and add it to both sides.

Add '25' to each side of the equation.

-10x + 25 + x2 = -13 + 25

Reorder the terms:

25 + -10x + x2 = -13 + 25

Combine like terms: -13 + 25 = 12

25 + -10x + x2 = 12

Factor a perfect square on the left side:

(x + -5)(x + -5) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting

(x + -5) equal to 3.464101615 and -3.464101615.

6 0

3 years ago

Add: 2x² - 8x -9 and 3 x² + 8x-2​

Add: 2x² - 8x -9 and 3 x² + 8x-2