Answer:
The way I would like to solve this would be by using transformations. The standard form for transformation is a|b(x-h)|+k. Here, " - " is the a. Whenever a is < 0, it reflects across x-axis. The opposite sign of C is the value of vertical symmetry. So, vertical symmetry is, -(-4), which is, 4. (-(c), d ) is how you find the vertex. Here, opposite of c is 4. There is no d so it will be 0. So, the vertex is (4,0)
Explanation:
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w-w-w desmos cam / practice
Thank me later.
Note : I disorted the link but I am sure that you are smart enough to find it out or type desmos in google.