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2 years ago

Simplify the following expression. 2x + 3x3 - 5x2 + x2 +7x + 1+ 7x -3x3 - 4

Mathematics

2 answers:

denis-greek [22]2 years ago

8 0

-4x^2+16x-3 is your answer

jek_recluse [69]2 years ago

4 0

Answer:

-4x^2 +16x -3

Step-by-step explanation:

2x + 3x^3 - 5x^2 + x^2 +7x + 1+ 7x -3x^3 - 4

Line up the numbers in decreasing power

3x^3 -3x^3 - 5x^2 + x^2 +7x +2x+ 7x - 4+1

Combine like terms

-4x^2 +16x -3

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Step-by-step explanation:

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Which of the following expressions are equivalent to \left(9\dfrac{7}{8} + 2\dfrac{4}{5}\right)-\dfrac{1}{2}(9 87 +2 54 )− 21

lora16 [44]

Answer:

$12\dfrac{7}{40}$

Step-by-step explanation:

The given expression is

$\left(9\dfrac{7}{8} + 2\dfrac{4}{5}\right)-\dfrac{1}{2}$

We need to find the simplified form of the given expression.

It can be rewritten as

$\left(9+\dfrac{7}{8} + 2+\dfrac{4}{5}\right)-\dfrac{1}{2}$

Combine integers and fractions separately.

$(9+2)+(\dfrac{7}{8}+\dfrac{4}{5}-\dfrac{1}{2})$

Taking LCM we get

$11+\dfrac{35+32-20}{40}$

$11+\dfrac{47}{40}$

In can be written as

$11+\dfrac{40+7}{40}$

$11+1+\dfrac{7}{40}$

$12+\dfrac{7}{40}$

$12\dfrac{7}{40}$

Therefore, the expression $12\dfrac{7}{40}$ is equivalent to the given expression.

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3 years ago

The sum of two consecutive integers is 85. What are those two integers?

chubhunter [2.5K]

Answer:

41 and 42

Step-by-step explanation:

Let the integers be x and x + 1

=> x + x + 1 = 85

=> 2x + 1 = 85

=> 2x = 84

=> x = 84/2

=> x = 41

Integers are :

41 and 42

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2 years ago