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Kamila [148]
3 years ago
10

How to factor x^3 - 4x^2 - 9x + 36 by grouping

Mathematics
2 answers:
const2013 [10]3 years ago
6 0

Answer:

(x-4) (x-3) (x+3)

Step-by-step explanation:

x^3 - 4x^2 - 9x + 36

Make 2 groups

x^3 - 4x^2            - 9x + 36

We can factor out x^2 from the first group and -9 from the second group

x^2 (x-4)    - 9(x-4)

Now factor out (x-4)

(x-4) (x^2 -9)

This may be an answer choice but we can still factor

(x^2 -9) is the difference of squares

(x^2-9) = (x-3) (x+3)

Replacing this

(x-4) (x-3) (x+3)

alukav5142 [94]3 years ago
4 0

Answer:

(x - 4)(x - 3)(x + 3)

Step-by-step explanation:

x³ - 4x² - 9x + 36

x²(x - 4) - 9(x - 4)

(x - 4)(x² - 9)

(x - 4)(x² - 3²)

(x - 4)(x - 3)(x + 3)

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How to solve 3p^2=-2p+4
harkovskaia [24]

Answer:

Step-by-step explanation:

Simplifying

3p2 + -2p = 4

Reorder the terms:

-2p + 3p2 = 4

Solving

-2p + 3p2 = 4

Solving for variable 'p'.

Reorder the terms:

-4 + -2p + 3p2 = 4 + -4

Combine like terms: 4 + -4 = 0

-4 + -2p + 3p2 = 0

Begin completing the square.  Divide all terms by

3 the coefficient of the squared term:

Divide each side by '3'.

-1.333333333 + -0.6666666667p + p2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.

-1.333333333 + -0.6666666667p + 1.333333333 + p2 = 0 + 1.333333333

Reorder the terms:

-1.333333333 + 1.333333333 + -0.6666666667p + p2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000

0.000000000 + -0.6666666667p + p2 = 0 + 1.333333333

-0.6666666667p + p2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333

-0.6666666667p + p2 = 1.333333333

The p term is -0.6666666667p.  Take half its coefficient (-0.3333333334).

Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.

-0.6666666667p + 0.1111111112 + p2 = 1.333333333 + 0.1111111112

Reorder the terms:

0.1111111112 + -0.6666666667p + p2 = 1.333333333 + 0.1111111112

Combine like terms: 1.333333333 + 0.1111111112 = 1.4444444442

0.1111111112 + -0.6666666667p + p2 = 1.4444444442

Factor a perfect square on the left side:

(p + -0.3333333334)(p + -0.3333333334) = 1.4444444442

Calculate the square root of the right side: 1.201850425

Break this problem into two subproblems by setting

(p + -0.3333333334) equal to 1.201850425 and -1.201850425.

Subproblem 1

p + -0.3333333334 = 1.201850425

Simplifying

p + -0.3333333334 = 1.201850425

Reorder the terms:

-0.3333333334 + p = 1.201850425

Solving

-0.3333333334 + p = 1.201850425

Solving for variable 'p'.

Move all terms containing p to the left, all other terms to the right.

Add '0.3333333334' to each side of the equation.

-0.3333333334 + 0.3333333334 + p = 1.201850425 + 0.3333333334

Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000

0.0000000000 + p = 1.201850425 + 0.3333333334

p = 1.201850425 + 0.3333333334

Combine like terms: 1.201850425 + 0.3333333334 = 1.5351837584

p = 1.5351837584

Simplifying

p = 1.5351837584

Subproblem 2

p + -0.3333333334 = -1.201850425

Simplifying

p + -0.3333333334 = -1.201850425

Reorder the terms:

-0.3333333334 + p = -1.201850425

Solving

-0.3333333334 + p = -1.201850425

Solving for variable 'p'.

Move all terms containing p to the left, all other terms to the right.

Add '0.3333333334' to each side of the equation.

-0.3333333334 + 0.3333333334 + p = -1.201850425 + 0.3333333334

Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000

0.0000000000 + p = -1.201850425 + 0.3333333334

p = -1.201850425 + 0.3333333334

Combine like terms: -1.201850425 + 0.3333333334 = -0.8685170916

p = -0.8685170916

Simplifying

p = -0.8685170916

Solution

The solution to the problem is based on the solutions

from the subproblems.

p = {1.5351837584, -0.8685170916}

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Marat540 [252]
That would be D. Adjacent because they share a side.
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Alex is saving money because she would like to purchase the new video gaming system that everyone has been talking about. After
ivanzaharov [21]


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She save from about $17.9 to $23.5

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7 0
3 years ago
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Given rectangle ABCD with vertices A(1, 4), B(3, 6), C(6, 3), and D(4, 1), what is the
Hitman42 [59]

Answer:

  10√2

Step-by-step explanation:

A(1, 4), B(3, 6), C(6, 3), D(4, 1)

The distance formula tells you the distance d between two points (x1, y1) and (x2, y2) is given by ...

  d = √((x2-x1)² +(y2-y1)²

Then the side lengths are ...

  AB = √(2² +2²) = √8 = 2√2

  BC = √(3² +(-3)²) = √18 = 3√2

The perimeter is twice the sum of these sides, so is ...

  P = 2(2√2 +3√2) = 10√2 . . . the perimeter of the rectangle

6 0
3 years ago
Whats the error?katie divided 4.25 by 0.25 and a got a quotient of 0.17.
m_a_m_a [10]
The answer is 17. The decimal point needed to be moved by 2 places to the right since the divisor is a decimal.
6 0
3 years ago
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