£24 - £26 /hr

Lloyd S.

Degree: Mathematics G100 (Bachelors) - Bristol University

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#### Subjects offered

SubjectLevelMy prices
Further Mathematics A Level £26 /hr
Further Mathematics A Level £26 /hr
Further Mathematics A Level £26 /hr
Further Mathematics A Level £26 /hr
Maths A Level £26 /hr
Further Mathematics GCSE £24 /hr
Further Mathematics GCSE £24 /hr
Maths GCSE £24 /hr

#### Qualifications

MathematicsA-LevelA*
Further MathematicsA-LevelA*
PhysicsA-LevelA*
EconomicsA-LevelB
 CRB/DBS Standard No CRB/DBS Enhanced No

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#### Ratings and reviews

5from 34 customer reviews

Juliet (Parent) May 23 2017

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### Solve x^2 + 8x +3 = 0 by completing the square.

Using the completing the square method: 1. Notice (x+4)2 = x2 + 8x +16 which differs from the question by a constant 2. So we can write:  x2 + 8x + 3 = (x+4)2 - 13      (check this yourself if you don't see it immediately) 3. So from the question we get: (x+4)2 -13 = 0 (x+4)2 = 13     (by ...

Using the completing the square method:

1. Notice (x+4)2 = x2 + 8x +16 which differs from the question by a constant

2. So we can write:

x2 + 8x + 3 = (x+4)2 - 13      (check this yourself if you don't see it immediately)

3. So from the question we get:

(x+4)-13 = 0

x+4 = +-sqrt(13)    (square root remembering to include the +-)

x = -4 +-sqrt(13)      (subtracting 4)

x = - 4 + sqrt(13)

x = - 4 - sqrt(13)

which can both be checked by substitution into the original equation.

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1 year ago

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