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Lesechka [4]
3 years ago
6

Which point is an x-intercept of the quadratic equation (x-8)(x+9)

Mathematics
2 answers:
Romashka-Z-Leto [24]3 years ago
7 0

The function can be written like f(x) = (x - 8)(x + 9).

Solve for the zero for both parts of the function.

0 = x - 8

0 + 8 = x - 8 + 8

8 = x

0 = x + 9

0 - 9 = x + 9 - 9

-9 = x

Therefore, the x-intercepts are (8, 0) and (-9, 0).

Best of Luck!

defon3 years ago
5 0

Solve for x in each set of parentheses by setting them to 0:

X -8 = 0

X = 8

X+9 = 0

X =-9

You have two x intercepts (8,0) and (-9,0)

You didn’t list any choices to pick from but it would be either if the ones above.

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The cost of 3 notebooks and 4 pencils is $8.50. Determine the cost of one notebook and one pencil
Assoli18 [71]
Call the notebooks x, and the pencils y. 
<span>3x + 4y = $8.50 and 5x + 8y = $14.50 </span>
<span>Then just solve as simultaneous equations: </span>
<span>3x + 4y = $8.50 </span>
<span>5x + 8y = $14.50 </span>

<span>5(3x + 4y = 8.5) </span>
<span>3(5x + 8y = 14.5) </span>

<span>15x + 20y = 42.5 </span>
<span>15x + 24y = 43.5 </span>

<span>Think: DASS (Different Add, Similar Subtract). 15x appears in both equations so subtract one equation from the other. Eassier to subtract (15x + 20y = 42.5) from (15x + 24y = 43.5) </span>

<span>(15x + 24y = 43.5) - (15x + 20y = 42.5) = (4y = 1) which means y = 0.25. </span>

<span>Then substitue into equation : </span>
<span>15x + 20y = 42.5 </span>
<span>15x + 5 + 42.5 </span>
<span>15x = 42.5 - 5 = 37.5 </span>
<span>15x = 37.5 </span>
<span>x = 2.5 </span>

<span>15x + 24y = 43.5 </span>
<span>15(2.5) + 24(0.25) </span>
<span>37.5 + 6 = 43.5 </span>

<span>So x (notebooks) are 2.5 ($2.50) each and y (pencils) are 0.25 ($0.25) each.</span>
6 0
3 years ago
X h(x)
nasty-shy [4]

Answer:

56

Step-by-step explanation:

8 0
2 years ago
A parabola opening up or down has vertex (0, 0) and passes through (-6,-9).
Firlakuza [10]

Answer:

the formula is 1.5x^2

Step-by-step explanation:

Since the vertex is 0,0 h and k are both 0

then you plug in the -6 and -9 to the equation

a(-6)=-9

3/2(x)^2

hope that answers your question

4 0
3 years ago
PLEASE HELP ME I DON’T GET IT &amp; IT DUE SOON !!!!!
s2008m [1.1K]

Answer:

Step-by-step explanation:

cows   chickens    legs                                               animals

 1               11             26        (1×4+11×2=4+22=26)     1+11=12

 2               9            26        (2×4+9×2=8+18=26)      2+9=11

 3               7          26         (3×4+7×2=12+14=26)      3+7=10

 4               5          26         (4×4+5×2=16+10=26)      4+5=9

 5               3           26        (5×4+3×2=20+6=26)      5+3=8

 6               1            26        (6×4+1×2=24+2=26)       6+1=7

1. minimum number of animals=7

2. chickens=3

3. cows=4

chickens=5

6 0
2 years ago
Correct answer only <br> no incorrect
Oksanka [162]

Answer:

f[n] = n2

Step-by-step explanation:

hope it helps

3 0
3 years ago
Read 2 more answers
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