RuralOregonDeputy RuralOregonDeputy

01-05-2017
Mathematics

contestada

QUESTION FOR 50 POINTS
Solve this equation using an algebraic method: (x + 4)(x - 4) = 9
Choices are:
x=5
x=4 and x=-4
x=9
x=5 and x=-5

Respuesta :

01-05-2017

(x+4)(x-4)=9 expand left side by performing indicated multiplication...

x^2-16=9 add 16 to both sides

x^2=25 take the square root of both sides...

x=±5

x=-5 and 5

So the answer would be the bottom choice.

Answer Link

phillipino2002 phillipino2002

01-05-2017

the answer is
x=5 and x=-5

Answer Link

Otras preguntas

The two-hundred-year period in Roman history marked by freedom, stability, and peace was known as the _____.

Why are economies never purely market or command economies? A. International law prohibits purely command or market economies. B. Government officials do not re

what two numbers add and get -18 and multiply and get 72?

One way the modern atomic model differs from Thomson's atomic model is that electrons are no longer scattered throughout and atom's positive matter like chocola

International events have no influence on the business cycle. True or False?

history The way that Americans lived and worked was greatly changed by the A. child laborers B.interchangeable parts C. Francis Cabot Lowell D. industrial re

are these equivalent or not? 2.5(3+x) and 2.5x+7.5

why were abolitionist opposed to how cotton was produced in the south

In a Punnett square, a recessive allele is recorded as a upper case letter. lower case letter. number. symbol.

5y-3x+2=0 to y=mx+b form