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kirill115 [55]
3 years ago
12

5x²-4(x²+1)how to factorise this?​

Mathematics
1 answer:
garri49 [273]3 years ago
6 0

Answer:

(x+2)(x-2)

Step-by-step explanation:

We have ,

\bf = 5x^2 -4(x^2+1)\\\\ \bf= 5x^2-4x^2-4 \\\\\bf= x^2 - 4 \\\\\bf =(x)^2-(2)^2 \qquad\bigg\lgroup \red{ \sf (a+b)(a-b)=a^2-b^2}\bigg\rgroup \\\\\boxed{\red{\bf=(x+2)(x-2)}}

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Which of the following statements is false?
kramer

Option D

The sum of two irrational numbers is always rational is false statement

<em><u>Solution:</u></em>

<h3><u>The sum of two rational numbers is always rational</u></h3>

"The sum of two rational numbers is rational."

So, adding two rationals is the same as adding two such fractions, which will result in another fraction of this same form since integers are closed under addition and multiplication. Thus, adding two rational numbers produces another rational number.

For example:

\frac{1}{4} + \frac{1}{5} = \frac{9}{20}

rational number + rational number = rational number

Hence this statement is true

<h3><u>The product of a non zero rational number and an irrational number is always irrational</u></h3>

If you multiply any irrational number by the rational number zero, the result will be zero, which is rational.

Any other situation, however, of a rational times an irrational will be irrational.

A better statement would be: "The product of a non-zero rational number and an irrational number is irrational."

So this statement is correct

<h3><u>The product of two rational numbers is always rational</u></h3>

The product of two rational numbers is always rational.

A number is said to be a rational number if it is of the form p/q,where p and q are integers and q ≠ 0

Any integer is a rational number because it can be written in p/q form.

Hence it is clear that product of two rational numbers is always rational.

So this statement is correct

<h3><u>The sum of two irrational numbers is always rational</u></h3>

"The sum of two irrational numbers is SOMETIMES irrational."

The sum of two irrational numbers, in some cases, will be irrational. However, if the irrational parts of the numbers have a zero sum (cancel each other out), the sum will be rational.

Thus this statement is false

5 0
3 years ago
Plz help- solve the inequality<br> -3(1 - z) &lt; 9<br> Use distributive property
Aleksandr [31]

Answer:

z

=

9

2

Step-by-step explanation:

anyway

good luck

5 0
3 years ago
Last basketball season John made 62% of the free throws he attempted. In the first game this season, John went to the free-throw
Step2247 [10]

Answer:

62 x 10 =620

Step-by-step explanation:

multiply

5 0
3 years ago
Pherris is graphing the function f(x) = 2(3)x. He begins with the point (1, 6). Which could be the next point on his graph?
Maurinko [17]

the next point would be (2,18)

4 0
3 years ago
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A(7x + 3) = b + 14x what The value of A
Ugo [173]
Answer: The value of A would be 2.
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3 years ago
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