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Katyanochek1 [597]
3 years ago
12

Let f(x) = 2x - 3. If f(x) = 15, what is x?

Mathematics
1 answer:
sergey [27]3 years ago
5 0

To find the value of input value 'x' of the function substitute the value of output value f(x) in the given function.

    If f(x) = 2x - 3 and we have to find the values of 'x' for f(x) = 15

    Substitute the value of f(x) in the given function,

15 = 2x - 3

2x = 15 + 3

2x = 18

x = 9

  • If g(x) = 3x + 2
  • For g(x) = 11

11 = 3x + 2

3x = 11 - 2

3x = 9

x = 3

  • If w(x) = 3x - 7
  • For w(x) = 14

114 = 3x - 7

3x = 21

x = 7

  • If h(x) = -2x - 5
  • For h(x) = -25

-25 = -2x - 5

25 = 2x + 5

2x = 20

x = 10

Learn more,

brainly.com/question/1221931

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Answer:

Step-by-step explanation:

f(x)  = 2x² + 14x - 4

= 2(x² + 7x) - 4

= 2(x² +7x + 3.5²) - 2(3.5²) - 4

= 2(x+3.5)² - 28.5

vertex (3.5, -28.5) = (7/2, -57/2)

The vertical intercept is the y-intercept, i.e., f(0) = -4.

The x-intercepts are the values of x for which y=0.

2x² + 14x - 4  = 0

x = [-14±√(14²-4(2)(-4))]/[2(2)] = [-7±√57]/2 ≅ -7.27, 0.27

5 0
3 years ago
What is the equation of a line that passes through the point (8, −2) and is parallel to the line whose equation is 3x + 4y = 15?
Dafna1 [17]

Step 1

<u>Find the slope of the given line</u>

we have

3x+4y=15

Isolate the variable y

Subtract 3x both sides

3x+4y-3x=15-3x

4y=-3x+15

Divide by 4 both sides

y=-\frac{3}{4}x+ \frac{15}{4}

the slope of the given line is

m=-\frac{3}{4}

Step 2

Find the equation of the line that passes through  the point (8,-2) and is parallel to the given line

we know that

if two lines are parallel, then their slopes are equal

The equation of the line into point-slope form is equal to

y-y1=m(x-x1)

we have

m=-\frac{3}{4}

(x1,y1)=(8,-2)

substitute in the equation

y+2=-\frac{3}{4}(x-8)

y=-\frac{3}{4}x+6-2

y=-\frac{3}{4}x+4  or  3x+4y=16

therefore

<u>the answer is</u>

y=-\frac{3}{4}x+4

or

3x+4y=16

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3 years ago
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Sladkaya [172]

Answer:

yes

Step-by-step explanation:

4 0
3 years ago
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-3(4u-v)-5(-v+3u)<br> For 20 points
natita [175]

Answer:

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Explanation:

−3(4u − v) − 5( − v + 3u)

[ Distribute ]

= (−3)(4u) + (−3)(−v) + (−5)(−v) + (−5)(3u)

= −12u + 3v + 5v + −15u

[ Combine Like Terms ]

= −12u + 3v + 5v + −15u

= (−12u + −15u) + (3v + 5v)

= −27u + 8v

- PNW

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What are a) the ratio of the perimeters and b) the ratio of the ratio of the areas of the larger figure to the smaller figure
vfiekz [6]
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3 years ago
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