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2 answers:
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The answer is $213 because you subtract the price sold by the price he bought them for and then you add them together (see work)
Answer:
x= -4
x= 4
Step-by-step explanation:
This is a quadratic equation, and can be solved very quickly since it only has two terms, the square one and the free term.
Hence the solutions is obtained following the steps from below:
x2-16=0
Lets sum to both side 16
x2-16=0+16
x2=16
Now, lets apply square root to whole equation:
The bars means that x can be-4 o 4, since -4^2=16 and 4^2=16