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NikAS [45]
4 years ago
8

What is the solution set of 4x^2-36= 0? (-3) (3) (-3,3)

Mathematics
2 answers:
PtichkaEL [24]4 years ago
8 0

Answer:

(-3, 3)

Step-by-step explanation:

The equation is:

4x^2-36=0

to clear for x, first we move the -36 to the right as a +36 (or you can also say that we add 36 to both sides):

4x^2=36

dividing by 4:

x^2=36/4\\x^2=9

taking the square root:

x= ± \sqrt{9}

we add the ±  because a square root has two solutions, a positive one, and a negative one.

Then we get:

x= ± 3

The solutions are -3 and +3

which is represented in the option (-3, 3)

ololo11 [35]4 years ago
6 0

Answer:

(-3, 3).

Step-by-step explanation:

4x^2-36= 0

4x^2 = 36    Taking square roots of both sides:

2x = +/- 6

x = +/- 3.

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Step-by-step explanation:

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3 years ago
The selling price of a refrigerator is $647.85. if the markup is 5% of the dealer's cost, what is the dealer's cost of the refri
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irina1246 [14]

Answer:

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Step-by-step explanation:

To find the area of a triangle, one must use the formula,

\frac{base*height}{2}

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Substitute in the values and solve;

\frac{9\frac{3}{4}*8\frac{1}{3}}{2}

In order to multiply the two fractions, one must convert them from mixed number form to improper fraction form. This can be done by multiplying the denominator (the number under the fraction bar), by the "number" part of the mixed number, and then adding the result to the numerator (the number over the fraction bar;

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Substitute,

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Cross simplify,

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Further simplify,

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Convert back to a mixed number divide the numerator by the denominator, write the whole-number result as the number outside of the fraction, and the remainder as the numerator of the fraction,

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expeople1 [14]

Answer:

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