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Oksana_A [137]
3 years ago
9

HELP PLS MANY POINTS Use the function f(x) to answer the questions: f(x) = 4x2 + 8x − 5 Part A: What are the x-intercepts of the

graph of f(x)? Show your work. (2 points) Part B: Is the vertex of the graph of f(x) going to be a maximum or a minimum? What are the coordinates of the vertex? Justify your answers and show your work. (3 points) Part C: What are the steps you would use to graph f(x)? Justify that you can use the answers obtained in Part A and Part B to draw the graph. (5 point

Mathematics
1 answer:
Andrei [34K]3 years ago
6 0

Answer:

see below

Step-by-step explanation:

f(x) = 4x^2 + 8x − 5

To find the x intercepts set y = 0

0 =4x^2 + 8x − 5

Factor

0=(2x-1)(2x+5)

Using the zero product property

2x-1 =0     2x+5 =0

2x=1            2x = -5

x = 1/2           x = -5/2

The x intercepts are ( 1/2 ,0)   and ( -5/2,0)

Rewriting in vertex form by completing the square

4 ( x^2 + 2x) -5

4 ( x^2+2x +1) -4*1 -5

4 ( x+1) ^2 -9

Vertex form is

a( x-h) ^2 +k  where ( h,k) is the vertex

The vertex is ( -1,-9)

We know it opens upwards since a > 0

Plot the vertex and the x intercepts

The graph is symmetric on  based on the vertex

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HELP HAVING BAD DAY
Leni [432]
<h3>Answer:  15 miles</h3>

===========================================

Work Shown:

t = time it takes to go from Jackie's house to her friends house

distance = rate*time

d = 30*t

This represents the distance they travel if they go 30 mph

Then when going back home, they take 6 minutes longer

6 minutes = 6/60 = 0.1 hours

So they take 0.1 hours longer meaning the t updates to t+0.1

d = r*t

d = 25*(t+0.1)

d = 25t+2.5

This represents the trip back home.

Since the distance d doesn't change, we can equate the two right hand sides and solve for t

30t = 25t+2.5

30t-25t = 2.5

5t = 2.5

t = 2.5/5

t = 0.5 hours = 30 minutes

d = 30t = 30*0.5 = 15 miles

7 0
3 years ago
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Evaluate (−1/6+0.6(−1/3)+1)2 What is the value of the expression? Enter your answer as a simplified fraction in the box.
horsena [70]

Conversion a decimal number to a fraction: 0.6 = 6/10 = 3/5

A) Write down the decimal 0.6 divided by 1: 0.6 = 0.6/1

B) Multiply both top and bottom by 10 for every number after the decimal point. (For example, if there are two numbers after the decimal point, then use 100, if there are three then use 1000, etc.)

0.6/1 = 6/10

Note: 6/10 is called a decimal fraction.

C) Simplify and reduce the fraction

6/10 = 3 * 2/5 * 2 = 3 * 2/5 * 2 = 3/5

Multiple: 0.6 * (-1/3) = 3 · (-1)/5 · 3 = -3/15 = -1 · 3/5 · 3 = -1/5

Multiply both numerators and denominators. Result fraction keep to lowest possible denominator GCD(-3, 15) = 3. In the following intermediate step, the fraction result cannot be further simplified by canceling.

In other words - three fifths multiplied by minus one third = minus one fifth.

Add: -1/6 + the result of step No. 2 = -1/6 + (-1/5) = -1 · 5/6 · 5 + (-1) · 6/5 · 6 = -5/30 + (-6/30) = -5 + (-6)/30 = -11/30

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of both denominators - LCM(6, 5) = 30. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 6 × 5 = 30. In the following intermediate step, the fraction result cannot be further simplified by canceling.

In other words - minus one sixth plus minus one fifth = minus eleven thirtieths.

Add: the result of step No. 3 + 1 = -11/30 + 1 = -11/30 + 1/1 = -11/30 + 1 · 30/1 · 30 = -11/30 + 30/30 = -11 + 30/30 = 19/30

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of both denominators - LCM(30, 1) = 30. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 30 × 1 = 30. In the following intermediate step, the fraction result cannot be further simplified by canceling.

In other words - minus eleven thirtieths plus one = nineteen thirtieths.

Exponentiation: the result of step No. 4 ^ 2 = 19/30^2 = 192/302 = 361/900

In other words - nineteen thirtieths raised to the power of squared = three hundred sixty-one nine-hundredths.

You're welcome.

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Answer:

D : 2.15d= 48.00

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Answer:

7 1/4

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