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3 years ago

Is the product of -5 +x and x+4 equal to the product of 5+x and x-4? Explain your answer.

Mathematics

2 answers:

beks73 [17]3 years ago

8 0

Let's find out!

-5 + x * x + 4.

-5 + x^2 + 4.

-5 + 4 + x^2.

-1 + x^2.

5 + x * x - 4.

5 + x^2 - 4.

5 - 4 + x^2.

1 + x^2

So, they are NOT the same, because one of the "1"'s are negative, and the other is positive.

son4ous [18]3 years ago

3 0

Answer:

The product of -5+x and x+4 is not equal to 5+x and x-4

Step-by-step explanation:

If we substitute x for 1, we can solve the first equation and get -20. However, when we solve the second equation, we get the answer -18. These products are not equal and therefore the answer would be no. If we substitute x for 2 to check our answer, we find that the first equation is -18. the second equation is -14. This proves that they are not equal.

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Question 3 2 pts Melanie has two job offers. Job1 pays $10 an hour and will allow her to work 40 hours a week. The job2 pays $7

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Answer:

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Step-by-step explanation:

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8 0

3 years ago

Which of the following statements is false?

nataly862011 [7]

Alright. So We Need To Take A Look At The Answer Choices. The Sum Of Two Rational Numbers Is Always Rational. This Is True. You Cant Add Bad With Bad And Get Good. So You Will Always Get Rational Numbers, So It Is Not A.

Lets Look At B. The product of a nonzero rational number and an irrational number is always irrational. This is True. Pi Times Any Number Is Irrational. If You Have A Repeating Decimal,You Can't Change It To A Whole Number.

Lets Look At C. The product of two rational numbers is always rational. This Is True. Any Rational Numbers Multiplied Will Always Be Rational. 3.5 * 4 = 14. this Is Still Rational, So Not C.

Lets Look At D. The sum of two irrational numbers is always rational.This Is Not True. If You Do: Pi + Pi, This Will Not Be Rational. So, It Is D.

So, Having Looked At All The Choices, The Answer Is D.

7 0

3 years ago

The Quadratic Formula, x equals negative b plus or minus the square root of b squared minus 4 times a times c, all over 2 times

DedPeter [7]

Answer:

The correct option is 2 .

Therefore ,the missing denominator of the solution. 4 plus or minus the square root of 2, all over is  2 . 

$x=\dfrac{4\pm\sqrt{2}}{2}$

Step-by-step explanation:

For a Quadratic Equation ax² + bx + c = 0

By Formula Method we get

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

So we have Quadratic Equation is 2x² - 8x + 7 = 0

On Comparing we get

$a=2\\b=-8\\c=7$

Substituting a , b, c values we get

$x=\dfrac{-(-8)\pm\sqrt{(-8)^{2}-4(2)(7)}}{2(2)}\\\\x=\dfrac{8\pm\sqrt{64-56}}{4}\\\\x=\dfrac{8\pm\sqrt{8}}{4}\\\\x=\dfrac{8\pm2\sqrt{2}}{4}\\\\x=2(\dfrac{4\pm\sqrt{2}}{4})\\\\x=\dfrac{4\pm\sqrt{2}}{2}$

Therefore ,the missing denominator of the solution. 4 plus or minus the square root of 2, all over is  2 . 

7 0

3 years ago

Which expression is equivalent to -3(2m-1) -n? 6m-n-3 6m-n+3 -6m-n-3 -6m-n+3

kirill115 [55]

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5 0

2 years ago

In what time will Rs 24000 amount to Rs 30000 at 10% p.a.?

o-na [289]

Answer:

2.5 years

Step-by-step explanation:

Given data

Principal= Rs 24000

Final amount A= Rs 30000

Rate r= 10%

The simple interest expression is

A=P(1+rt)

substitute

30000=24000(1+0.1*r)

30000=24000+2400t

30000-24000=2400t

6000=2400t

t= 6000/2400

t=2.5

Hence the time is 2.5 years

4 0

2 years ago