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Question

What is the converted form of the equation 5x2 – 6x – 2 = 0 after completing the square by the method of completion of the square?


A

(5x - 3)2 – 19 = 0

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B

(5x - 3)2 + 19 = 0

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C

(5x + 3)2 – 19 = 0

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D

(5x+3)2 + 19 = 0

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Solution

The correct option is A

(5x - 3)2 – 19 = 0


Multiplying the equation throughout by 5, we get

25x2– 30x – 10= 0

This is the same as

(5x)2 - 2×(5x)×3 + 32 - 32 - 10 = 0

(5x3)2 - 9 - 10 = 0

(5x3)2 - 19 = 0


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