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Write whether the following statements are true or false. Justify your answers. i) Every quadratic equation has exactly one root. ii) Every quadratic equation has at least one real root. iii) Every quadratic equation has at least two roots. iv) Every quadratic equations has at most two roots. v) If the coefficient of x2 and the constant term of a quadratic equation have opposite signs, then the quadratic equation has real roots. vi) If the coefficient of x2 and the constant term have the same sign and if the coefficient of x term is zero, then the quadratic equation has no real roots.

Solution: (i) The given statement is False. Let us consider an example, a quadratic equation x2 – 25 = 0 has two distinct roots... View Article

State whether the following quadratic equations have two distinct real roots. Justify your answer. i) x2 – 3x + 4 = 0 ii) 2x2 + x – 1 = 0 iii) 2x2 – 6x + 9/2 = 0 iv) 3x2 – 4x + 1 = 0 v) (x + 4)2 – 8x = 0 vi) (x – √2)2 – 2(x + 1) = 0 vii) √2 x2 -(3/√2)x + 1/√2 = 0 viii) x (1 – x) – 2 = 0 ix) (x – 1) (x + 2) + 2 = 0 x) (x + 1) (x – 2) + x = 0

Solution: (i) x2 – 3x + 4 = 0 The given quadratic equation x2 – 3x + 4 = 0 has no real roots. D = b2 –... View Article