3 years ago

Find AB in c thank you

Mathematics

1 answer:

nataly862011 [7]3 years ago

3 0

Have a good dayyyyyyyy

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This year the winner of the new york marathon ran the 8 kilometer event in 24 mins. What is the runners unit rate

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3km / 1 min because 24/8 =3

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3 years ago

-3x^2 plus 24x = 27 <br> complete the square

Rudik [331]

You can divide the whole expression by -3:

$-3x^2+24x=27 \iff x^2-8x = -9$

Recalling that

$(x-a)^2=x^2-2ax+a^2$

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$-8x = -2ax \iff a=4$

So, we want to complete

$(x-4)^2 = x^2-8x+16$

Which differs from $x^2-8x$ by 16. So, if we add 16 to both sides, we have

$x^2-8x=-9 \iff x^2-8x+16=7 \iff (x-4)^2=7$

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r=(36-6-4-4+2+4)/4

r=7

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257 1/2 should be the correct answer

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