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Mathematics

Is x = -3 a solution of the equation 2x² - 7x + 9 = 0 ?

Quadratic Equations

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Answer

Substituting, x = -3 in 2x² - 7x + 9 = 0 we get,

⇒ 2.(-3)² - 7(-3) + 9 = 0

L.H.S.,

⇒ 2.(9) + 21 + 9

⇒ 18 + 21 + 9

⇒ 48

Since, L.H.S. ≠ R.H.S.

Hence, proved that x = -3 is not a solution of the equation 2x² - 7x + 9 = 0.

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