fungsi invers dari f (x) = x^2 -1 / 2 - x^2 adalah...

f(x) = x² -1 / 2 - x²
y = x²-1/ 2-x²
y(2-x²)= x² - 1
2y - yx² = x ² -1
x² +yx² = 2y +1
x² ( 1 +y) = 2y +1
x² = 2y+ 1 / (1+y)
x= √(2y+1 / 1+y)
f¹ (x) = √(2x+1 / 1+x)
c.
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