Gujarati
4-2.Quadratic Equations and Inequations
easy

यदि समीकरण ${x^3} - 3x + 2 = 0$ के दो मूल बराबर हों तो मूल होंगे

A

$2, 2, 3$

B

$1, 1, -2$

C

$-2, 3, 3$

D

$-2, -2, 1$

Solution

(b) दिया गया समीकरण ${x^3} – 3x + 2 = 0$ है।

$\Rightarrow$ ${x^2}(x – 1) + x(x – 1) – 2(x – 1) = 0$

$\Rightarrow$ $(x – 1)({x^2} + x – 2) = 0$

$\Rightarrow$ $(x – 1)(x – 1)(x + 2) = 0$

अत: मूल $1,1, – 2$ हैं।

Standard 11
Mathematics

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