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

compare and contrast myths and legends

How many seconds ,4:30-5:05

As they multiply die and decompose algae deplete the oceans surface layers of oxygen. often the large amounts of farm fertilizer that run from fields into the r

which word is an antonym for the word sullen

Explain how inertia and the shape of a loop counteract the force of gravity to keep riders from falling out when a roller coaster goes through a loop traveling

Witch type of infection is typically treated with antibiotics

Some people have citizenship in two countries. This is known as __________ citizenship.

Which of the following most caused the Cold War? A.different views on communism and democracy B.different views on the use of the atomic bomb C.the division

Bile is considered to taste __________. a. sweet b. sour c. salty d. bitter

Why does Ponyboy go into the burning church to save the kids? a. He doesn't want to go to jail. b. He feels guilty. c. He is worried about the kids. d. He like