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Question
Show that x = –2 is a solution of 3x2 + 13x + 14 = 0.
Sum
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Solution
The given equation is 3x2 + 13x + 14 = 0
Putting x = –2 in the given equation, we get
LHS = 3 × (–2)2 + 13 × (–2) + 14
= 12 – 26 + 14
= 12 + 14 – 26
= 26 – 26
= 0 = RHS
∴ x = –2 is a solution of the given equation.
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