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 Bessemer process was a useful way of turning iron into steel true or false?

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

Which of the following fonts gives a word document informal look ?

on his first 5 tests, che averaged 92 points. on his next 3 tests hw scored 94, 85, and 85 points. what was his average for all 8 tests?

Find the area of the trapezoid. Question 5 options: 219.96 yd2 92.43 yd2 439.92 yd2 127.53 yd2

Read the passage from "Do Not Go Gentle into That Good Night:" Grave mean, near death, who see with blinding site Blind eyes could blaze like meteors and be g

What is the formula for a compound containing one atom of sodium, one atom of oxygen, and one atom of hydrogen

hyperbole is used in which of the following statements

Which two structures of plants and fungi perform similar functions

What type of land form is created at the plate Boundary in the US Pacific North West