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Mathematics

Find the nature of the roots of the following quadratic equations. If the real roots exist, find them :

2x2 - 6x + 3 = 0

Quadratic Equations

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Answer

Comparing 2x2 - 6x + 3 = 0 with ax2 + bx + c = 0, we get :

a = 2, b = -6 and c = 3.

Substituting values in b2 - 4ac, we get :

(6)24×2×3362412.\Rightarrow (-6)^2 - 4 \times 2 \times 3 \\[1em] \Rightarrow 36 - 24 \\[1em] \Rightarrow 12.

Since, b2 - 4ac > 0.

∴ There are two real and distinct roots.

Solving,

⇒ 2x2 - 6x + 3 = 0

For distinct real roots,

x = b±b24ac2a\dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Substituting values we get :

x=(6)±(6)24×2×32×2x=6±36244x=6±124x=6±234x=3±32.\Rightarrow x = \dfrac{-(-6) \pm \sqrt{(-6)^2 - 4 \times 2 \times 3}}{2 \times 2} \\[1em] \Rightarrow x = \dfrac{6 \pm \sqrt{36 - 24}}{4} \\[1em] \Rightarrow x = \dfrac{6 \pm \sqrt{12}}{4} \\[1em] \Rightarrow x = \dfrac{6 \pm 2\sqrt{3}}{4} \\[1em] \Rightarrow x = \dfrac{3 \pm \sqrt{3}}{2}.

Hence, x = 3±32.\dfrac{3 \pm \sqrt{3}}{2}.

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