Answer:
4
Step-by-step explanation:
We have to find the parameter a so that (-1,2) is part of the function f(x) = ax²+4.
To check if a point is part of a function, we can replace the values of x and y = f(x) with the coordinates of the point and then, if the equation stays true, then the point is part of the function.
So for (x,y) = (-1,2) to be part of the function y = f(x), this equation has to stands true:

Then, the function would have to be f(x) = -2x² + 4.
We can check with a graph as:
Answer: a = -2
Answer:
58,000
Step-by-step explanation:
Answer:
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Step-by-step explanation:
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X² + 4x + 8 = 0
x = -(4) ± √((4)² - 4(1)(8))
2(1)
x = -4 ± √(16 - 32)
2
x = -4 ± √(-16)
2
x = -2 ± 4i
2
x = -1 ± 2i
x= -1 + 2i or x = -1 - 2i