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nexus9112 [7]
3 years ago
14

HURRY Given ​ f(x)=x^2−2x−5​. Enter the quadratic function in vertex form in the box.

Mathematics
1 answer:
romanna [79]3 years ago
5 0

Answer:

f(x)=(x-1)^2-6

Step-by-step explanation:

The given quadratic function is

f(x)=x^2-2x-5

We complete the square to obtain the vertex form;

Add and subtract half the coefficient of x

f(x)=x^2-2x+(-1)^2-(-1)^2-5

Factor by identifying the perfect square

f(x)=(x-1)^2-1-5

Simplify to obtain the vertex form as

f(x)=(x-1)^2-6

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Which of the following is a point-slope equation of a line that passes through the points (-1,4) and (8,-2)
dexar [7]

Answer:

y = (2/3)x + 4 2/3

Step-by-step explanation:

For reference, a linear function has an equation of y = mx + b

The first thing we're going to do is use the slope formula, \frac{y2-y1}{x2-x1} or rise over run. In this case that looks like:

(-2-4) - (8 - -1)

-2 -4 comes out to - 6, and the denominator comes out to 9.

6/9 is equal to 2/3, which is our m or slope value.

Next we want to find the b value, or our y-intercept. To do that we'll plug one of the points into the equation with our new-found slope:

4 = (2/3)-1 +b

4 = -2/3 + b

4 2/3 = b

That means our complete equation is:

y = (2/3)x + 4 2/3

OR

y = (2/3)x + 14/3 (equivalent but an improper fraction rather than a mixed fraction).

4 0
3 years ago
Factor:
Naddik [55]

Answer:

D) (5x - 3) (25x^2+ 15x + 9)

Step-by-step explanation:

125 {x}^{3}  - 27 \\  \\  = ( {5x)}^{3}  -  {(3)}^{3}  \\  \\  = (5x - 3) \{(5x) ^{2}  + 5x \times 3 + ( {3})^{2}  \}\\  \\  = (5x - 3) \{25 {x}^{2}  + 15x  + 9\}

3 0
3 years ago
Which factorization is equivalent to this expression?
grigory [225]

Answer:

10(3x+7)

Step-by-step explanation:

we have the expression:

30x + 70

To factor this expression we need to indentify the components that are common in both terms.

At first glance there is nothing in common, but we can notice that 30 and 70 are multiples of 10, that is:

10*3=30\\10*7=70

so we can substitute this into the expression:

10*3x+10*7

and now that we have the common term (the number 10) we can factorize it, that is, take out the common term and include a parentheses:

10(3x+7)

8 0
3 years ago
Determine the domain on which the following is decreasing
Katarina [22]

Answer:

(-∞,4)

Step-by-step explanation:

the value is going down from the right until it reaches the vertex

4 0
3 years ago
Solve the equation 4 1/5+b= 9 3/5
victus00 [196]
4 1/5 + b = 9 3/5

4 1/5 - 4 1/5 + b = 9 3/5 - 4 1/5
(taking the same amount from each side to keep it balanced)

0 + b = 5 2/5
(subtracting 4 1/5 from each side)

b = 5 2/5
8 0
3 years ago
Read 2 more answers
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