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

A[n] _______ meal is neither bad nor good--it is simply in the middle.

Why is 21/100 greater than 1/5

In aquatic ecosystems net primary productivity is related to

Important mineral deposits, including large reservoirs of oil and natural gas, are associated with _____. continental shelves mid-ocean ridges ocean trenches ri

"The Happy Man" all of the following are examples of dark humor EXCET All of the following are examples of dark humor from "The Happy Man" EXCEPT..... . a. Toda

Which option accurately describes catholic theology and practices in the middle ages?

How do you set up and solve these inequalities-only 16-20

Events that sparked world war 1

What is the primary sense the excerpt from “Chicago” by Carl Sandburg engages in the reader?

Baroque music was often composed for a specific event or to honor a specific person. Identify a MODERN contemporary event that is connected to a musical piece.