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Ierofanga [76]
3 years ago
8

What two numbers add to 8 and multiply to 28

Mathematics
1 answer:
anygoal [31]3 years ago
5 0
Find numbers that multiply to 28 and add them to see if they add to 8
28=
1 and 28=29 not 8
2 and 14=16 not 8
4 and 7=11 not 8
that's it'
no 2 numbers
we must use quadratic formula

x+y=8
xy=28

x+y=8
subtract x fromb oths ides
y=8-x
subsitute
x(8-x)=28
distribute
8x-x^2=28
add x^2 to both sides
8x=28+x^2
subtract 8x
x^2-8x+28=0

if you have
ax^2+bx+c=0 then x=\frac{-b+/- \sqrt{b^{2}-4ac} }{2a}
so if we have
1x^2-8+28=0 then
a=1
b=-8
c=28

x=\frac{-(-8)+/- \sqrt{(-8)^{2}-4(1)(28)} }{2(1)}
x=\frac{8+/- \sqrt{-48} }{2}
x=\frac{8+/- 4 \sqrt{-3} }{2}
x=4+/- 2 \sqrt{-3}
x=4+/- 2i \sqrt{3}
there are no real numbers that satisfy this
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Of 60 cities, 3 have a lake and 29 have a river running through them. What fraction of these 60 cities have a lake or river runn
nekit [7.7K]
Hello!

We know our denominator is 60, because that is the total amount of cities. Now, we must find our numerator:

3 + 29 = 32

Fraction: 32/60

You can simplify this by dividing both the numerator and denominator by 4:

32 ÷ 4 = 8 60 ÷ 4 = 15

FRACTION (SIMPLIFIED): 8/15
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Part 1: Create your own quadratic equation that cannot be solved by factoring, but can be solved using the quadratic formula. Id
eimsori [14]
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example
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x=\frac{-7+/- \sqrt{29} }{2}
x=\frac{-7+ \sqrt{29} }{2} or \frac{-7- \sqrt{29} }{2}



7 0
3 years ago
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Each marble bag sold by hans marble company contains 7 yellow marbles for every 5 blue marbles. if a bag has 35 blue marbles, ho
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