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3 years ago

What is - 0.64? square root

Mathematics

2 answers:

ElenaW [278]3 years ago

6 0

Answer:

-0.8

Step-by-step explanation:

because it is a negative number and .64 divided by .8 equals .8 so it would basically be the same.

tankabanditka [31]3 years ago

3 0

They square root of 0.64 is 0.8

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The answer
the full the question is as follow:
Which of the following is an extraneous solution of (45 - 3x)^1/2 =x -9

for solving such an equation, this is the method:

finding the squared value of each member of the equation
[(45 - 3x)^1/2 ]² = (x -9)² (E)

extend each value of the member
[(45 - 3x)^1/2 ]² = 45 - 3x, because (sqrt a )² = a
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it means - 3x≥ -45 and x ≤ 15

(x -9)² = x²-18x + 81

so 45 - 3x = x²-18x + 81, this is equivalent to x² - 15x +36 =0

this equation should solve for x, for finding the help

Delta = 15² - 4*36 = 81, so x = - (-15) - sqrt (81) / 2 *1=15-9 /2= 3

and x = - (-15) +sqrt (81) / 2 *1= 15 +9/2= 24/2=12

for x= 12, the equation given above ( equation E) has no solution, because
we can find 3=9

so an extraneous solution is x = 12

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Answer:

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