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djverab [1.8K]
4 years ago
11

Matt gives half of his books to the local library and kept the other half.His best friend gives him 3 more books.He now has 57 b

ooks.How many did he have to start.
This is a algebra question haves to have a main first equation
Mathematics
1 answer:
Liula [17]4 years ago
6 0
Just work it backwords 57-3=54 then because this is hakf his original amount of books multioky by 2 and you get the answer 108. I hope this helped. :)
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3x^2 + 4x = -8<br> solve using quadratic formula
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Use the quadratic equation to solve this (image of the quadratic equation is below)

Remember that quadratic functions are set up like so:

ax^{2} +bx +c = 0

To make the equation 3x² + 4x = -8 into a quadratic function you must bring -8 to the left side of the equation so it equals zero. To do this add 8 to both sides

3x² + 4x + 8= -8 + 8

3x² + 4x + 8 = 0

That means that in this equation...

a = 3

b = 4

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^^^Plug these numbers into the quadratic equation and solve  (Keep in mind that +/- is ± )

\frac{-4+/-\sqrt{(4)^{2}-4(3)(8)}}{2(3)}

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^^^There is no real solution to this equation. You must have an imaginary solution

\frac{-4+/-i\sqrt{80}}{6}

Simplify

\frac{-2+/-2i \sqrt{5}}{3}

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