x²+4x-5x=o, solve this eqution by completent mathod and how do it,please anyone explain it.I will be like you.
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Step-by-step explanation:
By completing square method,
→ x² + 4x - 5 = 0
→ x² + 4x = 5
→ x² + 2(4/2)x = 5
→ x² + 2(2)x + 2² = 5 + 2²
→ (x + 2)² = 9
→ x + 2 = ±3
Case 1: If 3 is positive,
→ x = 3 - 2 = 1
Case 2: If 3 is negative,
→ x = - 3 - 2 = - 5
Hence x = - 5 and 1
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