Which of the following quadratic polynomials will touch the -axis at exactly one point?

MATHEMATICS · Single correct · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

Which of the following quadratic polynomials will touch the xx-axis at exactly one point? (a) x2+4x+5x^2+4x+5 (b) x2+4x+1x^2+4x+1 (c) 4x2+4x+14x^2+4x+1 (d) 2x2−3x+12x^2-3x+1

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