other govt exam DRDO CEPTAM Admin & Allied (A&A) 2022 Mock Test Quantitative Aptitude Algebra Polynomials

Which of the following is correct?

1
(a – b)2 = a2 + 2ab – b2
2
(a – b)2 = a2 – 2ab + b2
3
(a – b)2 = a2 – b2
4
(a + b)2 = a2 + 2ab – b2
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