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if you want to find the zero/null /x-intercept of any given function you have to find the x that makes it zero. therefore if
f(x) = 2x +4
you have to put
f(x) = 0
0 = 2x +4
2x = -4
x=-2
if you subsitute -2 for x you will find that the function f(x) will equal zero
f(x)= 2 * (-2) +4
f(x) = -4 +4
f(x) = 0
if you have more complex functions like squared your approach will look something like this
say g(x) is a function of x²
g(x)=(x-2)² +4
set g(x)= 0
0= (x-2)² -4
4= (x-2) ²
+ or - radical (4) = x -2
2 + radical (4) = x or 2 -radical (4) = x
x=4 or x = 0
remember radicals always have two solutions
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