state gov ICDS Maharashtra Mukhya Sevika Mock Test Series 2024 Quantitative Aptitude Algebra Identities
Write the correct alternative indicating the identities from the following
1
\(\frac{1}{x^2} + 2x + x^2 = \left(x + \frac{1}{x}\right)^2 \)
2
\(\frac{1}{3x^2} - 2 + (3x^2) = \left(\frac{1}{3x}-3x\right)^2 \)
3
\(\frac{1}{x^2} - x^2 = \left(\frac{1}{x}-x\right) \left(x + \frac{1}{x}\right) \)
4
\(\left(\frac{1}{x}+x\right)^2 = \left(\frac{1}{x}- x\right)^2 - 4 \)