College Algebra
posted by Edwin
3x^212x24=0

helper
3x^2 12x  24 = 0
Solve the quadratic equation by completing the square:
Divide both sides by 3:
x^2  4x  8 = 0
Add 8 to both sides:
x^2  4x = 8
Add 4 to both sides:
x^2  4x + 4 = 12
Factor the left hand side:
(x  2)^2 = 12
Take the square root of both sides:
x  2 = 2 sqrt(3)
Eliminate the absolute value:
x  2 = 2 sqrt(3) or x  2 = 2 sqrt(3)
Add 2 to both sides:
x = 2  2 sqrt(3) or x  2 = 2 sqrt(3)
Add 2 to both sides:
x = 2  2 sqrt(3) or x = 2 + 2 sqrt(3) 
sharlette
A wheel made 672 revolutions at 35 1/5 revolutions per minute. How many minutes did it rotates?
Respond to this Question
Similar Questions

Algebra
Can someone please check my work for me. Q: Plot the graph of the equations 2x  3y = 5 and 4x  6y = 21 and interpret the result. A: 6(2x ¨C 3y = 5) = 12x ¨C 18y = 30 3(4x  6y = 21) = 12x  18y = 63 12x ¨C 18y = 30 + 12x  18y … 
algebra
5x 3 = 11 + 12x combine like figures add 3 to both sides to remove the 3 5x= 14+ 12x Now I get confused. If I remove the 12x I have to subtract 12x from 5x which gives me an answer of 7x=14 would the correct answer thus be x= 2? 
algebra
24x^412x^3+48x^2/4x 24x^412x^3+12(1) 24x^412x^3+(12x) 2x^412x^312x check this problem for me please 
st paul (math college algebra)
rational expessions 7/38/12x8 
COLLEGE ALGEBRA
Solve by completing the square 12x^2+11x=5 
COLLEGE ALGEBRA ..HELP!
Solve by completing the square 12x^2+11x=5 
College algebra
Find the value of f(x) = 3x^2 + 12x8 
College algebra
20x^2+12x 
Algebra. Please check my answers
Evaluate a/b+c^d for a=6,b=3,c=4 and d=5 A.42*** B.18 C.82 D.360 What is the simplified form of the expression ? 
Algebra
What is the vertex form of the equation? y = x^2+12x4 My work: (x^2 + 12x)4 (x^2 + 12x + 36)4 + 36 Y= (x+36)^2 + 32 Is this correct?