CBSE Math Revision

CBSE Maths revision for Class 9 to 12

2,400+ original questions, marked step by step the way the board marks. No calculator needed.

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5 quick questions on quadratic Equations. No sign-in needed.

The equation \(2x^2 + 4x + k = 0\) has no real roots exactly when

Choose your answer · keys 1–4

A\(k \gt 2\)B\(k \lt 2\)C\(k = 2\)D\(k \ge 2\)

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CBSE Math Revision is an independent revision site for CBSE Class 9, 10, 11 and 12 Maths, run by Pete Bromfield, a former Head of Maths with examining experience. It has 2,400+ original questions with step-by-step solutions marked the way the board marks, all workable without a calculator, plus free chapter pages, sample papers and formula sheets, and a weekly view of progress for families.