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worty [1.4K]
3 years ago
9

Need help with these

Mathematics
1 answer:
Alecsey [184]3 years ago
3 0

Answer: OOF

Step-by-step explanation: that looks hard

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Find two numbers, if Their sum is −7 and their difference is 14
Schach [20]

let those numbers be x and y

According to your question

x + y = -7

x - y =14

adding both equations

2x = 7

or x = 7/2

substitute value of x in either equation

y = -21/2

So,

x= 7/2

y=-21/2

Hope this helps!

Thanks

7 0
3 years ago
Identify the vertex, focus, and directrix of the parabola with the equation x^2-6x-8y+49=0
NeTakaya
Get it in form 4P(y-k)=(x-h)^2
add 8y to both sides
x^2-6x+49=8y
complete the square
-6/3=-3, (-3)^2=9
(x^2-6x+9)+40=8y
(x-3)^2+40=8y
minus 40 both sides
(x-3)^2=8y-40
undistribute 8 on right side
(x-3)^2=(y-5)8
4P(y-k)=(x-h)^2
4(2)(y-5)=(x-3)^2

(h,k) is center
p is distance from vertex to directix and also from vertex to focus
p=2
vertex=(3,5)
in that form, the prabola opens up so
directix is 2 below vertex
focus is 2 above vertex
up and down is y so
5-2=3
5+2=7

directix is y=3
focus=(3,7)
vertex=(3,5)
5 0
3 years ago
Read 2 more answers
Which statement best compares the graphs of y=-3x^n and y=3x^n?
devlian [24]

Answer:

The graph of y=-3x^n is the reflection of the graph of y=3x^n about the x axis.

Step-by-step explanation:

If you graph these two functions, then you will notice that they look similar. for example the points of (1,-3) on graph y=-3x^n and point (-1,-3) on graph y=3x^n. They have the same y value but just the reflection of the x value. I hope this helped !!

4 0
4 years ago
Read 2 more answers
What is the domain of the function y= _X+6 - 7?
Tresset [83]

Answer:

we know that

The radicand  of the function must be greater than or equal to zero

so

the solution is the interval---------> [-6,∞)

therefore

the answer is

The domain are all values of x  greater than or equal to minus six

4 0
4 years ago
Read 2 more answers
Simplify (2x - 2y) (2y + 8) =?
Alika [10]

Answer:

it is 4xy-4y^2+16x-16y

Step-by-step explanation:

My method is to "square them"

2x.          -2y.      

                         2y

                         8

2x * 2y

2x * 8

-2y*2y

-2y * 8

and add all the products together

6 0
4 years ago
Read 2 more answers
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