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xenn [34]
1 year ago
15

Which equations are true for x = –2 and x = 2? Select two options

Mathematics
1 answer:
fomenos1 year ago
7 0

Answer:

Number 1 and Number 4

Step-by-step explanation:

By factoring, you can figure out the roots (x = -2 or x = 2)...

1. x^2 - 4 = 0

--> (x + 2)(x - 2) = 0

--> x = -2, x = 2

2. x^2 + 4 = 0

--> factors weirdly, so I won't write it. You'd have to use the quadratic formula.

3. 3x^2 + 12 = 0

--> 3 (x^2 + 4) = 0

--> factors weirdly (same as above)

4. 4x^2 - 16 = 0

--> 4 (x^2 - 4) = 0

--> 4 (x+2) (x-2) = 0

--> x = -2, x = 2

5. 2 (x-2) 2 = 0

--> x = 2

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By using a calculator,

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Is y=7x proportional
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Step-by-step explanation:

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Nostrana [21]

Answer:

A = 3x³ - 22x² + 30x - 36

Step-by-step explanation:

Area of a Rectangle: A = lw

Step 1: Define

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Step 2: Substitute and Evaluate

A = (3x² - 4x + 6)(x - 6)

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A = 3x³ - 22x² + 30x - 36

3 0
2 years ago
Read 2 more answers
4 A curve has equation y=x^3 - 2x² +5. Find the coordinates of its two stationary points.​
vodomira [7]

Answer:

Stationary points are <u>(</u><u>0</u><u>,</u><u> </u><u>5</u><u>)</u><u> </u><u>and</u><u> </u><u>(</u><u>4</u><u>/</u><u>3</u><u>,</u><u> </u><u>1</u><u>0</u><u>3</u><u>/</u><u>2</u><u>7</u><u>)</u>

Step-by-step explanation:

At stationary point (turning point), dy/dx :

y =  {x}^{3}  - 2 {x}^{2}  + 5 \\  \frac{dy}{dx}  = 3 {x}^{2}  - 4x \\  \\  \frac{dy}{dx}  = x(3x - 4)

but dy/dx = 0:

x(3x - 4) = 0 \\ either \: x \: is \: 0 \: and \: (3x - 4) = 0 \\ x = 0 \\ and \\ 3x - 4 = 0 \\ x =  \frac{4}{3}

let y = x³ - 2x² + 5:

when \: x \: is \: 0 \\ y = 5 \\ when \: x \:  is \:   \frac{4}{3}  \\  \\ y =  {( \frac{4}{3}) }^{3}  - 2 {( \frac{4}{3} )}^{2}  + 5 \\  \\  y =  \frac{103}{27}

5 0
3 years ago
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