Gujarati
4-2.Quadratic Equations and Inequations
easy

समीकरण ${x^2} - 5|x| + \,6 = 0$ के हलों की संख्या है

A

$4$

B

$3$

C

$2$

D

$1$

Solution

(a) दिया गया समीकरण ${x^2} – 5|x| + 6 = 0$ है।

अर्थात् ${x^2} – 5x + 6 = 0$ एवं ${x^2} + 5x + 6 = 0$

${x^2} – 3x – 2x + 6 = 0$ एवं ${x^2} + 3x + 2x + 6 = 0$

$(x – 3)\,(x – 2) = 0$ एवं  $(x + 3)\,.\,(x + 2) = 0$

$x = 3,x = 2$ एवं $x =  – 3,\,x =  – 2$.

अर्थात् इस समीकरण के चार हल होंगे।

Standard 11
Mathematics

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