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49/2-((1/4)*x^2) = 0
(-1/4)*x^2+49/2 = 0
-1/4*x^2 = -49/2 // : -1/4
x^2 = 98
x^2 = 98 // ^ 1/2
abs(x) = 7*2^(1/2)
x = 7*2^(1/2) or x = -(7*2^(1/2))
x in { 7*2^(1/2), -(7*2^(1/2)) }
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