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Ilia_Sergeevich [38]
3 years ago
13

What are the coordinates of the x-intercepts of the graph of y = 2x2 + 6x – 20? A) (–5, 0) , (2, 0) . B) (5, 0) , (–2, 0) . C) (

–4, 0) , (10, 0) . D) (4, 0) , (–10, 0)
Mathematics
1 answer:
fomenos3 years ago
5 0
Y = 2 x² + 6 x - 20 = 2 ( x² + 3 x - 10 ) = 2 ( x² + 5 x - 2 x - 10 ) =
= 2 ( x ( x + 5 ) - 2 ( x + 5 ) ) = 2 ( x + 5 ) ( x - 2 )
x 1  = - 5,  x 2  = 2
Answer: A ) ( - 5, 0 ), ( 2, 0 ) 
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2. Graph the function y=x^2+2x-3 . Draw a chart to show at least three ordered pairs that are on the graph.
lidiya [134]
You'd have to draw a table of x and y values first to be able to graph.
Step 1: Pick any number for x. Let's pick 2.
Step 2: Plug in 2 into the equation: y = 2^2 + 2(2) - 3
Step 3: Solve for y: 4 + 4 - 3 = 5
Step 4: So the point (ordered pair) would be (x, y) ⇒ (2, 5). You can plot that on the graph.

Follow these steps 2 more times to get at least three ordered pairs.

Make sure you have enough points to know where the graph curves, then you can connect the dots and now there you have a graph and chart :)
6 0
2 years ago
A number written in the form a + bi is called a _____ number.
Amiraneli [1.4K]

Answer: A. Complex

Step-by-step explanation: hope this helps!

6 0
2 years ago
in an isosceles triangle the measure of the angle formed by the two congruent side is 80 degrees what is the measure of each bas
Free_Kalibri [48]
Based on the answer it is right there 80%
8 0
3 years ago
Hevesh wants to make 2 lines of dominoes that are both 21 inches long. Each line has dominoes spaced 1 and 1/2 inches apart. How
aliya0001 [1]

Answer: 30 dominoes in total.

Step-by-step explanation:

Each line is 21 inches long.

the space between dominoes is 1 + 1/2 inches.

(assuming that the distance includes the domino itself) Now, we need at least two dominoes to see this distance,

The we have N + 1 dominoes per line, and the distance is:

N*(1 + 1/2)inches = 21 inches

If we find N, we can find the number of domineoes in each line:

N = 21/(1 + 1/2) = 14

This means that we have 14  + 1 = 15 dominoes in each line, and we have two lines, so we have 30 dominoes in total.

3 0
3 years ago
If f(x)=x/2+8what if f(x) when x=10
Zinaida [17]

Answer:

f(10)=13

Step-by-step explanation:

f(x)=x/2+8

Let x = 10

f(10)=10/2 +8

      = 5 + 8

      = 13

5 0
3 years ago
Read 2 more answers
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