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4 years ago

X+y+z =4

1 answer:

4 0

Akar akar persamaan kuadrat 2x² - 3x -1 = 0 adalah x1 dan x2. Persamaan kuadrat baru yang akar akarnya satu lebih kecil dari dua kali akar akar persamaan kuadrat di atas adalah ........A.x² - x - 4 = 0B.x² + 5x - 4 = 0C.x² - x + 4 = 0D.x² + x + 4 = 0E.x² - 5x - 4 = 0Jawaban : A
Penyelesaian :
Akar-akar persamaan lama : x1 dan x2

Akar-akar persamaan baru : xA dan xB
 xA = 2x1 - 1
 xB = 2x2 - 1
 xA + xB = (2x1 - 1) + (2x2 - 1)
 = 2 (x1 + x2) - 2
 = 2 () - 2
 = 3 - 2
 xA + xB = 1

 xA . xB = (2x1 - 1) (2x2 - 1)
 = 4 x1.x2 - 2(x1 + x2) + 1
 = 4.(-) - 2() + 1
 = -2 - 3 + 1
 xA . xB = -4

Jadi persamaan kuadrat baru : x² - (xA + xB)x + xA . xB = 0
 x² - x - 4 = 0

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HELP I'm very bad at story questions lolol

Mila [183]

1ST Piece =======> 2x ======> 2 * 3 ft. ======> 6 ft.

2ND =========> 5x =======> 5 * 3 ft. ======> 15 ft.

3RD ==========> 4 Feet =======> 4 ft.

Sum ======> 25 Feet

Equation:

(2x + 5x) + (4) = 25

Let's solve your equation step-by-step.

2x + 5x + 4 = 25

Step 1: Simplify both sides of the equation.

2x + 5x + 4 = 25

(2x + 5x) + (4) = 25 (Combine Like Terms)

7x + 4 = 25

Step 2: Subtract 4 from both sides.

7x + 4 − 4 = 25 − 4

7x = 21

Step 3: Divide both sides by 7.

7x / 7 = 21 / 7

Answer ========> x = 3

Check:

(2x + 5x) + (4) = 25

2(3) = 6

5(3) = 15

3rd Piece = 4

Sum = 25

6ft. + 15ft. + 4ft = 25

25 = 25

Hope that helps!!!!!!!!!!!!! : )

6 0

4 years ago

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ycow [4]

Based on the information provided, the most accurate definition of science is the process of using different skills to create different scientific models.

<h3>What is a Scientific Model?</h3>

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Modeling nature, events, and observable patterns help us to understand and predict them more in the larger environment.

There are at least three major types of scientific models. They are:

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The correct answer, thus, is B) Using different skills to make models.

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2 years ago

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attashe74 [19]

Answer:

1/4

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3 years ago

How do you do this problem? I need to know how you found the answer.

Alexxandr [17]

to get the equation of a line, we simply need two points, say for the Red one ... notice in the graph the lines passes through (0,2) and (-1,6), so let's use those

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now, for the Blue one, say let's use hmmm it passes through (0,2) and (1.6)

$\bf (\stackrel{x_1}{0}~,~\stackrel{y_1}{2})\qquad (\stackrel{x_2}{1}~,~\stackrel{y_2}{6}) \\\\\\ slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{6-2}{1-0}\implies \cfrac{4}{1}\implies 4 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-2=4(x-0) \\\\\\ y-2=4x\implies \blacktriangleright y=4x+2 \blacktriangleleft$

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3 years ago

What are the integer solutions of the inequality |x| < 2 ?

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3 years ago