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4 years ago

(9x2 + 8x) - (2x2 + 3x)

Mathematics

2 answers:

kakasveta [241]4 years ago

8 0

Answer:

14+5x

Step-by-step explanation:

jek_recluse [69]4 years ago

4 0

Answer:

$7 {x}^{2} + 5x$

Step-by-step explanation:

$(9 {x}^{2} + 8x) - (2 {x}^{2} + 3x) \\ = 9 {x}^{2} + 8x - 2 {x}^{2} - 3x \\ = 9 {x}^{2} - 2 {x}^{2} + 8x - 3x \\ = 7 {x}^{2} + 5x$

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Firlakuza [10]

Answer:

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I think that answer

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AlekseyPX

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3 years ago

A coin is tossed three times. An outcome is represented by a string of the sort HTT (meaning a head on the first toss, followed

Ivanshal [37]

Answer:

Step-by-step explanation:

In this question, the sample space contains 8 elements and has been given as;

HHT HHH THH HTH HTT TTT TTH THT

1. For event A:

Outcomes of alternating tail and head = THH HTH HTT THT

= 4 outcomes

Pr(alternating tail and head (with either coming first)) = $\frac{4}{8}$

= $\frac{1}{2}$

2. For event B:

Outcomes of no tails on the first two tosses = HHT HHH

= 2 outcomes

Pr (No tails on the first two tosses) = $\frac{2}{8}$

= $\frac{1}{4}$

For event C:

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= 2 outcomes

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= $\frac{1}{4}$

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3 years ago

Select the best answer for the question.

Lena [83]

(3/4)(4/4)=(3*4)/(4*4)=12/16
7/16
(5/8)(2/2)=(5*2)/(8*2)=10/16

/Answer: Option C. 12/16, 7/16, 10/16

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3 years ago

Please help me please will give brainliest do only 23 ,25, by factoring

yaroslaw [1]

9514 1404 393

Answer:

23) x = ±3i, ±√2

26) x = 4/3, (-2/3)(1 ± i√3)

Step-by-step explanation:

23) Put in standard form to make factoring easier.

x^4 +7x^2 -18 = 0

(x^2 +9)(x^2 -2) = 0 . . . . factors in integers

Using the factoring of the difference of squares, you can continue to get linear factors in complex and irrational numbers:

(x -3i)(x +3i)(x -√2)(x +√2) = 0

x = ±3i, ±√2

___

26) This will be the difference of cubes after you remove the common factor.

81x^3 -192 = 0

3(27x^3 -64) = 0

(3x -4)(9x^2 +12x +16) = 0 . . . . . factor the difference of cubes

The complex roots of the quadratic can be found using the quadratic formula.

x = (-12 ±√(12^2 -4(9)(16)))/(2(9)) = (-12 ±√-432)/18 = -2/3 ± √(-4/3)

Then the three solutions to the equation are ...

x = 4/3, (-2/3)(1 ± i√3)

5 0

3 years ago