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Question
Write the discriminant of the quadratic equation (x + 5)2 = 2 (5x − 3).
Solution
Given the quadratic equation is (x + 5)2 = 2 (5x − 3).
⇒ x2 +25 +10x =10x -6
⇒ x2 + 31 = 0
⇒ x2 +0x +31 = 0
So, the discriminant will be
D =b2 -4ac
= 02 - 4 × 1 × 31= -124
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