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2 years ago

Complete the square to re-write the quadratic function in vertex form: y = x2 + 4x – 9

Mathematics

2 answers:

Alona [7]2 years ago

5 0

Answer: − 2 ± √ 13

Step-by-step explanation:

(-b±√(b²-4ac))/(2a)

Plug in and solve.

Helen [10]2 years ago

3 0

Answer:

y = (x + 2)² - 13

Step-by-step explanation:

y = x² + 4x - 9

To complete the square

add/ subtract ( half the coefficient of the x- term)² to x² + 4x

y = x² + 2(2)x + 4 - 4 - 9

= (x + 2)² - 13 ← in vertex form

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Someone pls help:( I can’t

max2010maxim [7]

Answer:

x = 8 is the answer :)

Step-by-step explanation:

Slope(m) = -2/5

slope is passing through the points: (x,1) and (3,3)

$m=\frac{y_2-y_1}{x_2-x_1}$

$m = \frac{3-1}{3-x}$

$m=\frac{2}{3-x}$

$-\frac{2}{5} =\frac{2}{3-x}$

-2(3 - x) = 2 × 5

-6 + 2x = 10

2x = 10 + 6

2x = 16

x = 8

Hopefully, this answer helped :)

8 0

2 years ago

Calculate the percent error. Jerri estimated that 30 people would attend the

kipiarov [429]

Answer:she errored

Step-by-step explanation:

3 0

2 years ago

21 The graph of an exponential function is shown on the grid.

morpeh [17]

Answer:

C The range is the set of all real numbers greater than 0.

Step-by-step explanation:

We see that the function has positive range and no restriction of domain.

A The range is the set of all real numbers less than 0.

Incorrect, positive values only

B The domain is the set of all real numbers greater than-4.

Incorrect, the domain can get any value

C The range is the set of all real numbers greater than 0.

Correct, the range is restricted to positive values

D The domain is the set of all real numbers less than-4.

Incorrect, no restrictions

5 0

2 years ago

What is k-15=-8?<br><br><br> I need help with this one<br> Btw it is asking what k equals.

LuckyWell [14K]

Answer:

k=7

Step-by-step explanation:

Add 15 to both sides, -8+15=7

So, K=7

4 0

2 years ago

Two men walk at rates of 6 mph and 10 mph, respectively. Simultaneously, they started from the same place walking waking in oppo

VladimirAG [237]

Answer:

12.5 hours :)

Step-by-step explanation:

Let after t hours , the two men are 200 miles apart

So the distance traveled by fthe irst man is 6 miles

And the distance traveled by the second man is 10 miles

So the equation is 6t+10t=200

Therefore after 12.5 hours, they are 200 miles apart.

P.S. Please give me brainliest!

6 0

1 year ago