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3 years ago

Find each difference. (2x2-5x-7)-(7x2+3) PLEASE HELP!!!

Mathematics

2 answers:

vova2212 [387]3 years ago

8 0

Answer:

-5x-48

Step-by-step explanation:

First, simplify the first half,

(2x2-5x-7) --> (4-5x-7) --> (-5x-7+4) --> (-5x-13)

Then, simplify the second half,

(7x2+3) --> (7x5) --> (35)

Finaly put them together

-5x-13-35, subtract like terms

-5x-48

This is the most simplifyed it can get because of the variable.

Hope this helps, if you have a question if you are confused,

Have a good day and if you can, please give me brainliest, it will help a lot. :)

Natasha2012 [34]3 years ago

3 0

Answer: $-5x^{2} -5x-10$

Step-by-step explanation:

$(2x^{2} -5x-7)-(7x^{2} +3)$

subtract by terms.

2x^2 - 7x^2 = -5x^2

-5x is the only term so leave it alone

-7-3= -10

-5x^2 -5x -10

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Stolb23 [73]

Answer:

Step-by-step explanation:

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$E[N(t)]= \lambda t\\\\=\frac{1}{3}(24)\\\\=8$

(Here. t = 24)

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$Var[N (t)]= Var[N(24)]\\= E [N (24)]\\=8$

(Poisson distribution mean and variance equal)

The standard deviation of the number of planets is,

$\sigma( 24 )] =\sqrt{Var[ N(24)]}=\sqrt{8}= 2.828$

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