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dybincka [34]
3 years ago
12

Solve the equation by completing the square

Mathematics
2 answers:
photoshop1234 [79]3 years ago
6 0

Answer:

r=18, -4

Step-by-step explanation:

NeTakaya3 years ago
4 0

Answer:

r=18 or r= -4

Step-by-step explanation:

Please see attached picture for full solution.

Before completing the square, ensure that the coefficient of r^2 is 1 and bring all the terms to the left hand side. In this case, we do not have to do this as it is already done.

Since the sign before '14r' is a negative sign, use the formula as shown in the first picture.

We know that the value of 'b' in the formula is 7 because 2(r)(b)= 14r. Hence,

2b= 14

b= 7

Step 5: remember to add '±' whenever you introduce a square root.

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\sf{\red{ANSWER \: \: :}}

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\sf{\purple{EXPLANATION \: \: :}}

x - 20 + 2x = 35

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The length of a swimming pool is 8 m longer than it's width and the area is 105m²​
Art [367]

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Step-by-step explanation:

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