Sum
Solve the following quadratic equations
(i) x2 + 5x = 0 (ii) x2 = 3x (iii) x2 = 4
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Solution
(i) x2 + 5x = 0 ⇒ x(x + 5) = 0
⇒ x = 0 or x + 5 = 0
⇒ x = 0 or x = – 5
(ii) x2 = 3x
⇒ x2 – 3x = 0
⇒ x(x – 3) = 0
⇒ x = 0 or x = 3
(iii) x2 = 4
⇒ x = ± 2
Concept: Solutions of Quadratic Equations by Factorization
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