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Solve the equation x2 + 4x - 7 = 0 by completing the square. Give your answers correct to 2 decimal places.
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9 votes
9 votes
Solve the equation

x2 + 4x - 7 = 0
by completing the square.
Give your answers correct to 2 decimal places.

User Usman Khalid
by
2.6k points

1 Answer

27 votes
27 votes
Answer: 0.44

Step by step explanation:

2x + 4x - 7 = 0
Collect like terms to get:
6x^2 - 7 = 0
Add seven to both sides:
6x^2 = 7
Square root both sides to get
6x = 2.65 (rounded to 2dp)
Divide 6 by both sides:
x = 0.44
User Lucahuy
by
2.6k points
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