check math
posted by Anonymous .
Here are my answers. Can you check if I got the right answers? Thank you!
(x+3)(x3)>0 answer: x<3 or x>3
x^22x15</=0 answer: 3</=x</=5
12x^2=3x answer: x=1/4
sin2x=sinx, 0</=x</=2pi answer: x=pi
lx3l<7 answer: (oo,oo)
(x+1)^2(x2)+(x+1)(x2)^2=0
answer: x=1,2,1/2
27^(2x)=9^(x3)answer: x=3/2
logx+log(x3)=1 answer: x=2, 5
(x+3)(x3)>0 answer: x<3 or x>3 ok
x^22x15</=0 answer: 3</=x</=5 ok
12x^2=3x answer: x=1/4 also x = 0, (12x^2  3x = 0 > x(12x3)=0 )
sin2x=sinx, 0</=x</=2pi answer: x=pi
no. recall that sin2x = 2(sinx)(cosx)
so
2(sinx)(cosx)sinx=0
sinx(2cosx 1=0
sinx=0 or cosx=1/2
then x=0,pi,2pi from the first
or x = pi/3 (60º) or 5pi/3 (300º)
lx3l<7 answer: (oo,oo) No, 4≤x≤10
(x+1)^2(x2)+(x+1)(x2)^2=0
answer: x=1,2,1/2 ok
27^(2x)=9^(x3)answer: x=3/2 ok
logx+log(x3)=1 answer: x=2,5
Your answer of x=2 does not work in logx, you cannot take the log of a negative number. So just x=5
Respond to this Question
Similar Questions

Math
Hi, would someone mind just checking the answer I got for this formula and tell me if I'm on the right track or not. Question... x+y=21 3x=4y Answer I got... x=84 y= 63 I didn't get that. Check your math. I found 7y=63 but not y = … 
Algebra
Can someone check my algebra answers and help me with the problems I don't understand? 
Algebra
Would someone please check these answers? 
check math
Here are my answers. Can you check if I got the right answers? 
8th Grade Algebra: Answer Check
Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12 … 
8th Grade Algebra: Answer Check #2
Add or Subtract (Radicals) { this means squared 1.3{2 + 4{2 Answer: 7{2 2. 8{3 + 3{3 Answer: 11{3 3. 7{5  3{5 Answer: 4{5 4. 8{2  5{2 Answer: 3{2 5. 6{x + 7{x Answer: 13{x 6. 9{y + 3{y Answer: 12{y Multiply 7. 3x^2(4x^23x5) Answer: … 
maths
1. Q: 23x5 when x=(3) A: 24 2. Q: 6x+4 when x=5 A: 5 _______________ Simplify the expression. 1. (4)(x)(x^2) my answer: 4x^3 2. (24)(5x)(x) my answer: 120x^2 3. x(4x) my answer: 4xx 4. 4t(t+2) my answer: 4t^2+(6t) … 
Math 8R: Homework Check  Part 2
Part 2: Simplify by combining like terms and using the distributive property 11. 3x + 5x Answer: 8x 12. 3x + 5y  2x + 8, Answer: 1x + 5y + 8 13. 9 + 5m + 6b  2m  4, Answer: 3m + 5 + 6b 14. 3ab + 6c  ab + 10  2c, Answer: 2ab + … 
PreCalculus
Could someone check my answers? 25. 32^(2x3)=2 Answer x= 8/5 26. 9^(2x+1)=81 Answer x= 1/2 27. 1/4=2^3x Answer x= 2/3 28. 1/27=3^2x Answer x= 3/2 29. 9^x=27 Answer x= 3/2 30. 32^x=4 Answer x= 2/5 31. 27^(x+1)=9 Answer x= 
math
Can someone please check ny answers and tell me if I'm correct?