(Q9) (1-1 ) solving quadratic equation in one variable.

1sec ≫ First term  ≫ Algebra ≫ Unit 1 ≫ (1-1 )  solving quadratic equation in one variable.

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(Q9)

In the opposite figure:

The S.S. of the equation \( f(x) = 0 \) in \( \mathbb{R} \) is:

1. \(\{0, -4\}\)
2. \(\{(-2, 0)\}\)
3. \(\varnothing\)
4. \(\{-2\}\)

(d).