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4 years ago

Solve this quadratic equation by completing the square. x2 + 4x = 15

Mathematics

1 answer:

xenn [34]4 years ago

4 0

Answer:

x = -2 + √19, x = -2 - √19

Step-by-step explanation:

Equation: x² + 4x = 15

Complete the square of ax² + bx: x² + 4x + 4

Insert into equation (with balancing): x² + 4x + 4 = 15 + 4

Change form: (x + 2)² = 15 + 4

Combine like terms: (x + 2)² = 19

Square root: x + 2 = ±√19

Isolate x: x = -2 ± √19

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3 years ago

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2 years ago

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3 years ago

Write equibalent fraction for 2/3 and 3/4 using 12 as the common denominator

iogann1982 [59]

Answer:

2/3 = 8/12

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Step-by-step explanation:

whatever you do to the denominator, you have to do the the numerator.

2/3 - 3 times 4 equals 12 and 2 times 4 = 8. so 2/3 = 8/12

3/4 - 4 times 3 equals 12 and 3 times 3 equals 9. so 3/4 = 9/12

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3 years ago