Which of the following curve touches X-axis -
(A) x² - 2x + 4 (B) 3x² - 6x + 1
(C) 4x² - 16x + 9 (D) 25x² - 20x + 4
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if there are roots of a quadratic equation then it will cut the x axis. root must be real . if there are no real roots it would not touch x axis. just see if they have roots. the formula of root is if alpha and beta are roots ; alpha, beta= -b+√b^2-4ac or-b-√b^2-4ac
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