kristinak
A quadratic equation is shown below:
x2 - 8x + 13 = 0
Which of the following is the first correct step to write the above equation in the form (x - p)2 = q, where p and q are integers?
Subtract 5 from both sides of the equation
Subtract 3 from both sides of the equation
Add 5 to both sides of the equation
Add 3 to both sides of the equation
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myininaya
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do you know how to complete the square?
let's practice
do you think x^2-2x+1 can be written as a square?
kristinak
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yes
kristinak
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@myininaya
kristinak
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i was thnking it was D?
myininaya
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can you write is as a square for me?
kristinak
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(X-1)^2
myininaya
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okay so if you do that then we have
x^2-8x+13+3=0+3
x^2-8x+16=3
myininaya
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so are you think x^2-8x+16 can be written as square?
myininaya
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and you are right about my example
kristinak
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Yes
myininaya
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x^2-8x+16 can be written as (x- ? )^2
myininaya
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what is ?
kristinak
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(x-4)^2
myininaya
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yeah
myininaya
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you did this all by yourself @kristinak
kristinak
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yeah but i still dont know the answer
myininaya
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you are saying we have (x-4)^2=3
myininaya
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4 and 3 are totally integers
kristinak
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so its b?
myininaya
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:(
myininaya
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Can you tell me where you are confused on your first choice?
kristinak
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i thought you said i was wrong when i said it was D?
myininaya
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never said that
myininaya
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i simply was working through what D would have given us
myininaya
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do you not think 4 and 3 are integers?
kristinak
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No they are
kristinak
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thank you so much, sorry i was confused
myininaya
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its okay
kristinak
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can you help me with another?
myininaya
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alright
kristinak
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one moment
kristinak
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kristinak
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@myininaya
kristinak
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its the screenshot
myininaya
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can you find the vertex for the first one?
kristinak
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one moment
kristinak
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(70,55)
kristinak
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am i right?
myininaya
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beautiful!
myininaya
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now the vertex is very important for consider the min or even the max for a parabola
that is why i asked
for the other graph i think a good way to approximate the vertex is just plot those points given
myininaya
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i want you to speculate on what you think the vertex is
myininaya
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now it helped me to actually plot the points
so i encourage you to do so
myininaya
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tell me what you think looks like the middle point of that graph
kristinak
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(1,899.50)
myininaya
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that is very great
myininaya
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now the y values for each of these points is the amount of min production cost from each graph
myininaya
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aka lowest y value for each graph
myininaya
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the question ask you to compare the y values basically
it ask which one is greater
kristinak
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company 2?
myininaya
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right because 899.5>55
so company 2 has a bigger min production cost
kristinak
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thank you!! can you help me with like 2 or 3 more?
myininaya
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honestly
i cannot
i have to leave
i suggest posting a new question
kristinak
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oh okay thank you
myininaya
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np
have a great night