Find the coordinates of the vertex of y = -3x2 -6x + 2.
We can start with the formula for the x-coordinate of the vertex of the quadratic equation:
Where a and b are the coefficients in the general quadratic equation shown below:
Next, to find the values of a and b, we can compare the quadratic equation with the general quadratic equation as shown:
By comparing, we have a = -3, b = -6 and c = 2
Now, we can substitute the equation with span class="bold text-gold">a = -3 and b = -6. By doing so, we can solve for x.
Hence, we have:
With x = -1, we can use it to find the y-coordinate of the vertex. To do so, we substitute x = -1 into the equation as shown below:
The y-coordinate of the vertex is 5. Therefore the coordinates of the vertex is (-1,5).
Clearly, the answer is C.
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