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Solve $- x^{2} + 5 x - 4 = 0$ by the quadratic formula.

Class 10The Quadratic FormulaAlgebra — Quadratics

A-1 and -4
B1 and 4
C-1 and 4
D1 and -4

Step-by-Step Solution

With

a = - 1, b = 5, c = - 4 : D = 25 - 4 (- 1) (- 4) = 25 - 16 = 9. x = \frac{- 5 \pm 3}{- 2} = 1

or 4. (Multiplying the equation by -1 first gives

x^{2} - 5 x + 4 = 0

and the same two roots.)

Answer: B) 1 and 4

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