Let's say that number is hmmm "a"

now.. twice "a" is 2*a or 2a
4 less than that is " 2a - 4"

now, the product of those two fellows is 286, well ok

a( 2a - 4) = 286

thus

$\bf a(2a-4)=286\implies 2a^2-4a^2=286\implies a^2-2a^2=143
\\\\\\
a^2-2a^2-143=0\implies (a-13)(a+11)=0
\\\\\\
\begin{cases}
a-13=0\implies &a=13\\
a+11=0\implies &\boxed{a=-11}
\end{cases}$

5 0

4 years ago

Solve the system of equations by using elimination?<br> 2x+y=8<br> 3x+3/2=12

polet [3.4K]

Answer:

x=7/2 y=1

Step-by-step explanation:

3 0

3 years ago

Which of the following best describes the algebraic expression 7(x + 12) - 4

Rudik [331]

Answer:

7(x+12) - 4

7x + 84 - 4

7x + 80

4 0

4 years ago

Read 2 more answers