Question 60

Which of the following is not a quadratic equation?

Solution

(A) : $$3x(x + 5) -11 = 2x(x - 2) + 6$$

=> $$3x^2 + 15x - 11 = 2x^2 - 4x + 6$$

=> $$x^2 + 19x - 17 = 0$$

(B) : $$4x(x + 3) + 7 = 4x(x - 11) + 9$$

=> $$4x^2 + 12x + 7 = 4x^2 - 44x + 9$$

=> $$56x - 2 = 0$$

(C) : $$x(x + 2) -15 = x(2x - 5) + 11$$

=> $$x^2 + 2x - 15 = 2x^2 - 5x + 11$$

=> $$x^2 - 7x + 26 = 0$$

(D) : $$4x^{2} - 6x - 9 = 0$$

$$\therefore$$ Option (B) is not a quadratic equation.

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