SOLUTION: **these problems has to be factored.... please help... i have been doing these problems for homework and these are my last four.*****they are due tomorrow. we had a week to do...61
Algebra.Com
Question 177417: **these problems has to be factored.... please help... i have been doing these problems for homework and these are my last four.*****they are due tomorrow. we had a week to do...614 problems....please help
612) 9x5 – 18x4 = 9x^4(x-2)
613) z4 – 16=(z^2+4)*(z^2+4)*(z-2)*(z+2)
614) x3 – 27=(x-3)*(x^2+3x+9)
615) Solve: 25x2 – 64 = 0
Found 2 solutions by stanbon, jim_thompson5910:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
612) 9x^5 – 18x^4 = 9x^4(x-2)
9x^4(x -1) = 9x^4(x-2)
x-1 = x-2
-1 = -2
That is a contradiction.
The problem has no solution
----------------------------------------
613) z^4 – 16=(z^2+4)*(z^2+4)*(z-2)*(z+2)
(z^2-4)(z^2+4) = (z^2+4)^2 * (z^2-4)
1 = (z^2+4)
z^2 = -3
z = sqrt(3)i or z = -sqrt(3)i
----------------------------------------
614) x^3 – 27=(x-3)*(x^2+3x+9)
That is an identity and is true for all values of x
-----------------------------
615) Solve: 25x2 – 64 = 0
(5x-8)(5x+8) = 0
x = 8/5 or x = -8/5
====================================
Cheers,
Stan H.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
612) Correct
613) Close, but
614) Correct
615)
Start with the given equation
Factor the left side (use the difference of squares)
Now set each factor equal to zero:
or
or Now solve for x in each case
So the answers are
or
RELATED QUESTIONS
I have been struggling with this equation for 3 days, and can not understand what I am... (answered by MathLover1)
I have been working on these problems for ever. and i can't solve them. and i need to... (answered by apachemexican1)
I AM A PARENT TRYING TO HELP MY 13 YR. OLD WITH HIS ALGEBRA. I HAVE BEEN OUT OF SCHOOL... (answered by checkley71)
I am really having trouble understanding how to solve a system of equations by graphing.... (answered by mananth)
LEASE HELP I HAVE A QUIZ ON TUESDAY Okay, so lately I've been having trouble in Algebra.... (answered by Alan3354,MathLover1)
Please help! I'm stuck on one of these problems on my homework. ( I'm not trying to be... (answered by stanbon)
Does anyone know how to solve these two problems?
Been having trouble with these... (answered by scott8148)
My niece is being home-schooled (8th grade) and has gotten into some algebra and geometry (answered by Targetweek,rapaljer)
A polynomial x has degree 3. The coefficient of x^2 is 3 less than the coefficient of... (answered by ankor@dixie-net.com,scott8148)