If y varies directly as x, and y = 20 when x = 4. Find y when x = 2.
2 answers:
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By evaluating the quadratic function, we will see that the differential quotient is:
Here we have the quadratic function:
Evaluating the quadratic equation we get:
So we need to replace the x-variable by "2 + h" and "2" respectively.
Replacing the function in the differential quotient:
If we simplify that last fraction, we get:
The third option is the correct one, the differential quotient is equal to 8 + 4.
If you want to learn more about quadratic functions:
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