Quadratic Equation

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[b]1.[/b] The Sum of the roots of x[sup]2[/sup]-x+1=0 is[br]

1 None of the above[br] 2 -1

[b]2.[/b] For [i]ax[/i][sup]2[/sup] + [i]bx[/i] + [i]c[/i] = 0, which of the following statement is wrong?

If b[sup]2[/sup] = 4ac , the roots are real and equal. If b[sup]2[/sup] = 4ac , the roots are real and unequal. If b[sup]2[/sup] – 4ac is a perfect square, the roots are rational If b[sup]2[/sup] – 4ac is negative, no real roots exist.

[b]3.[/b] The roots of the equation 9[i]x[/i][sup]2[/sup] – [i]bx[/i] + 81 = 0 will be equal, if the value of b is

(b) ± 18 (c) ± 27 (a) ± 9 (d) ± 54

Quadratic Equation

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Information: Quadratic Equation