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

Which of the following events would most likely cause an increase in Indian nationalism?

the henry family drove 276.5 miles on the family vaction. They used 7.9 gallons of gas.how many miles per gallon of gas did they get on the trip

4 times the sum of 14 + 26

This man is considered the father of history?

30% of a number is 120 what is 75% of the number A:90 B:300 C:27 D:48

How did Solomon's death affect the Israelites?

Weightlifters are often concerned with the amount of protein in their diets because growing muscles require protein. Just as muscles need the basic building bl

If if takes 3 mins to sew 1in, how many mins will it take to sew 9ft?

a rectangle has length 3 1/4 feet and width 1 1/3 feet

Doubling the sum of Steve's and Sophie's ages gives 38. If Sophie is 10 years old, how old is Steve? a. 4 b. 28 c. 14 d. 9