LoopyG30
LoopyG30 LoopyG30
  • 26-03-2018
  • Mathematics
contestada

If x is a whole number and 437 = (21 + x)(21 - x), then x =

Relax

Respuesta :

penfila11Pen
penfila11Pen penfila11Pen
  • 26-03-2018
Hey there :)

We know that ( a + b )( a - b ) is a² - b²

So here we apply this formula
( 21 + x )( 21 - x ) = 21² - x²

437 = 21² - x²
437 = 441 - x²
Rearrange the equation
x² = 441 - 437
x² = 4
[tex] \sqrt{x^2} = \sqrt{4} [/tex]

x = +2 or -2

Ver imagen penfila11Pen
Answer Link

Otras preguntas

List several characteristics of class Chondrichthyes that separate it from class Agnatha and class Osteichthyes.
Carbon-14 dating could be used to estimate the age of all of the following except A. fossils b. ancient scrolls c. petrified wood d. artifacts from the titanic
What is 2/5 of 12930?
(4,?) is on the line below. find the other half of the coordinate. y=2/7x+3
If you are in an earthquake situation which of the following should you do? A. All of the answers are correct B. If in a vehicle, move to a clear area away from
What is Bonach space?
The germ theory of disease established that many diseases are caused by _____.
I need to know if this is correct thankyou
Why does ball believe that the united states is justified in fighting in vietnam?
A strong password should change --------------------