Determine whether the values given against the quadratic equation are the roots of the equation: x^2 + 4x - 5 = 0, x = 1, -1

Doubtly Asked 24 Oct 2026 Save WhatsApp Report

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Answer: 1 is a root; −1 is not a root.

A value is a root if it makes the left side zero.

\(x = 1\): \(1^2 + 4(1) - 5 = 1 + 4 - 5 = 0\). So 1 is a root.

\(x = -1\): \((-1)^2 + 4(-1) - 5 = 1 - 4 - 5 = -8 \neq 0\). So −1 is not a root.

Doubtly AI · 24 Oct 2026 AI-verified · Oct 2026 Report

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