1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kisachek [45]
4 years ago
10

Solve this equation using an algebraic method: (x + 4)( x - 4) = 9

Mathematics
2 answers:
Lostsunrise [7]4 years ago
5 0
Use FOIL method first to get rid of ()
x^2 - 4x + 4x -16 = 9
x^2 - 16 = 9
move the 16 over by addition
x^2 = 25
Then take the square root and get
x = 5
Luden [163]4 years ago
3 0
Perform indicated operations on left side

x*x+4x+4x+4*4=9

x^2+4x+4x+16=9  combine like terms on left side

x^2+8x+16=9  subtract 9 from both sides

x^2+8x+7=0  factor

x^2+x+7x+7=0

x(x+1)+7(x+1)=0

(x+7)(x+1)=0

x=-1, -7
You might be interested in
PLEASE ANSWER AT LEAST ONE AND IF YOU CAN, ANSWER MORE THAN ONE. THANK YOU!!!!
liubo4ka [24]

Answer:

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
One should continue to monitor his or her goals and adjust his or her plan for achieving them when it is necessary?
attashe74 [19]

Answer:

I think this is a true or false if so the answer is true:)

8 0
3 years ago
Find the solution to the following system of linear equations.
bearhunter [10]
Infinitely many solutions
3 0
4 years ago
Read 2 more answers
What equivalent fractions for 2 3/5 and 1 1/3 using a common denominator
inysia [295]
2 9/15 and 1 5/15 are your answers
8 0
3 years ago
Read 2 more answers
can anyone explain this question please - What is the standard form of the following equation? y+3=1/4x Use integers for A, B, a
Vlad1618 [11]
Standard form is
ax+by=c
where a,b,c are integers

y+3=1/4x
timesboth sides by 4
4y+12=x
minus x both sides
-x+4y+12=0
minus 12 both sides
-x+4y=-12
(I like x to be positive so)
times both sides by -1
1x-4y=12
a=1
b=-4
c=12
4 0
3 years ago
Other questions:
  • What is the slope of a line that runs parallel to y = -x + 7?
    7·2 answers
  • NAME THE PROPERTY FOR AB=CD and CD = XY, then AB=XY.
    7·2 answers
  • In 2000 the population of a country reached 1 ​billion, and in 2025 it is projected to be 1.2 billion. ​(a) Find values for C an
    6·1 answer
  • Write the slope intercept form of the equation through the given point with the given slope.
    9·1 answer
  • 4 divided 5 2/3 please and thank you
    5·2 answers
  • The sum of the measures of two complementary angles is 74° greater than the difference of their measures. Find the measure of ea
    5·1 answer
  • Donna just put 27.43 gallons of fuel into her car. There were 1.7 gallons in the car to begin with. how much furl is in donnas c
    10·1 answer
  • What is a derivative.
    5·1 answer
  • If you drive at 110 km/hr for 5 hours, how far will you go?
    14·1 answer
  • How many three-digit natural numbers can be formed using only the even digits, if the numbers can contain each of these digits o
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!