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4 years ago

Which number is IRRATIONAL? A) 9 B) 27 C) 36 D) 81

2 answers:

7 0

Example: π (Pi) is a famous irrational number. ... You cannot write down a simple fraction that equals Pi. The popular approximation of 22/7 = 3.1428571428571... is close but not accurate. Another clue is that the decimal goes on forever without repeating. so B is irrational

Olenka [21]4 years ago

3 0

Answer:

None of the above

Step-by-step explanation:

We have to find irrational number in given options.

Rational number: That number which can not written as $\frac{p}{q}$ where p and q are integers, $q\neq 0$

Irrational number: The number which is not a rational number then, the number is called irrational number.

A.9

9 is an integer .Therefore, it belongs to rational number set not irrational number set.

So, it is false.

B.27

27 is an integer number.Therefore, it belongs to rational number set not irrational number set.

So, it is false.

C.36

36 is an integer number.Therefore, it belongs to rational number set not irrational number set.

So, it is false.

D.81

81 is an integer number.Therefore, it belongs to rational number set not irrational number set.

So, it is false.]

Answer: none of the above

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Answer:

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by definition of like terms;

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3 years ago

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Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

lawyer [7]

Given:

The quadratic equation is:

$12a^2+9a+7=0$

To find:

The solution of the given equation in simplest form by using the quadratic formula.

Solution:

If a quadratic equation is $ax^2+bx+c=0$ , then the quadratic formula is:

$x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

We have,

$12a^2+9a+7=0$

Here, $a=12,b=9,c=7$ . Using the quadratic formula, we get

$x=\dfrac{-(9)\pm \sqrt{(9)^2-4(12)(7)}}{2(12)}$

$x=\dfrac{-9\pm \sqrt{81-336}}{24}$

$x=\dfrac{-9\pm \sqrt{-255}}{24}$

$x=\dfrac{-9\pm i\sqrt{255}}{24}$ $[\because \sqrt{-a}=i\sqrt{a}]$

The solutions of the given equations are $x=\dfrac{-9-i\sqrt{255}}{24}$ and $x=\dfrac{-9+i\sqrt{255}}{24}$ .

Therefore, the correct option is B.

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3 years ago

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Answer:

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Step-by-step explanation:

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