Solve the following quadratic equation by factorisation method :\[ x^2 + x - 20 = 0 \]

Q.2 (B)(iii) Solve the following quadratic equation by factorisation method :

\[ x^2 + x - 20 = 0 \]

Doubtly Asked 25 Oct 2026 ssc 10th Save WhatsApp Report

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Best answer

Answer: \(x = 4\) or \(x = -5\)

\(x^2 + x - 20 = 0\)

\(x^2 + 5x - 4x - 20 = 0\)

\(x(x + 5) - 4(x + 5) = 0\)

\((x + 5)(x - 4) = 0\)

So \(x + 5 = 0\) or \(x - 4 = 0\), giving \(x = -5\) or \(x = 4\).

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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