All categories

2 years ago

One of the solutions to x2 − 2x − 15 = 0 is x = −3. What is the other solution?

2 answers:

7 0

If you factor the equation you can see what the solutions are. Two factor a quadratic of the form ax^2+bx+c, find two values which satisfy two conditions...

jk=ac=-15 and j+k=b=-2 so j and k must be -5 and 3 so the factors are:

(x-5)(x+3)

So the other solution is x=5

Tcecarenko [31]2 years ago

6 0

The answer is D) X=5 on E2020 (:

You might be interested in

What is the answer to this equation using substitution x+y=1

FromTheMoon [43]

{ x + y = 1 * ( - 2 )
2 x + 3y = -4

- 2 x - 2 y = - 2
2 x + 3 y = - 4
_______________
y = - 6

Subsititute y = - 6

2 x + 3 y = - 4

2 x + 3 * (-6) = -4

2 x - 18 = - 4

2 x = - 4 + 18

2 x = 14

x = 14 / 2

x = 7

The solution to the system of equations are:

x = 7 and y = - 6

hope this helps!

4 0

2 years ago

Solve the following in-equations and graph the solution on the number line

OverLord2011 [107]

Answer:

Step-by-step explanation:

$\frac{x-4}{3}$ ≥ - 2

x - 4 ≥ - 6

x ≥ - 2

x ∈ [ - 2 , ∞ )

2 - 6x < 32

- 6x < 30

x > - 5

x ∈ ( - 5 , ∞ )

6 0

1 year ago

In a simple regression analysis (where y is a dependent and x an independent variable), if the slope is positive, then it must b

Scorpion4ik [409]

Answer:

c. there is a positive correlation in-between x and y

Step-by-step explanation:

A regression line is a line that suggests that all the points in a scatter diagram lie on or near one particular line. In a simple regression analysis in which y is the dependent variable and x is the independent variable. If the slope is positive, the bivariate data is also said to have a positive correlation. The positive correlation in-between two variables x and y implies that in general, an increase in x goes hand in hand with an increase in y.

3 0

1 year ago

A helicopter leaves an airport and flies south at 180 mi/h. Thirty minutes later, an airplane leaves the airport and follows the

stira [4]

Answer:

36 minutes

Step-by-step explanation:

helicopter 1 is ahead of helicopter 2 by 90 miles

the difference in their speeds is 150 mph

90/150=3/5 of hour

3/5*60=36 minutes

8 0

2 years ago

The sum of two numbers is 19. Their difference is 65. What are the numbers?

quester [9]

Isn't it 89 not 19 and if its that, its 12 and 77

6 0

2 years ago