1. Which of the following is a quadratic equation.
(a) (x + 1)² = 3 (x + 7) (b) X-9 = 0
(c) (x - 1)(x +3) = (x-2) (x +1) (d) x + 5x - 7 = (x-4)
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Answer:
a)(X+1)^2=3(X+7)
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