3 years ago

Kari thinks, "x is the difference between 87 and 34.25 is this true or not?

Mathematics

1 answer:

Pavlova-9 [17]3 years ago

4 0

This is true because it is an unknown number so it is replaced by a variable.

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The product of some negative number and 4 less than twice that number is 286 find the number

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Let's say that number is hmmm "a"

now.. twice "a" is 2*a or 2a
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now, the product of those two fellows is 286, well ok

a( 2a - 4) = 286

thus

$\bf a(2a-4)=286\implies 2a^2-4a^2=286\implies a^2-2a^2=143
\\\\\\
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\\\\\\
\begin{cases}
a-13=0\implies &a=13\\
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\end{cases}$

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