grade nine math Polynomials
posted by peyton on .
Mr. Smart just bought a new dog named Fluffy. Mr Smart would like to enclose a play space for Fluffy in his back yard. The 5 side play space has the dimensions, in metres. They are x +11, 2x-4,3x.
Write a simplified expression for the number of metres of fencing needed to enclose this space. Would this be correct
5 (x+11) + (2x-4) +(3x)
Determine the amount of fencing Mr. Smart will need to enclose the space if x= 7m?
Would this be correct
5(x+11) + (2x-4) + (3x)
5x +55 +10x -20 +15x
(5x+10X+15x) + (55-20)
= 30x + 35
Do these answers seem right! Please help!! Thanks
I am confused by your solution.
In the opening part you state that the enclosure is 5 sided, but then you give only 3 dimensions.
in your expression you have 5 of the x+11, then you are adding the other two.
That would make it 7-sided, wouln't it?
Is there something missing in the first part?
Sorry I should of stated that the 5 sided enclosure only gave 3 dimensions that's why I multiplied by 5. This is why I was unsure.
In that case neither the question nor your solution make any sense.
According to your algebraic expression, you have 7 sides.
it was a 5 sided pentagon but the problem only gave me 3 dimensions.
As i said, the problem makes no sense, and cannot be solved as it stands.
alright? so do you think i should question my own teacher?
Of course! How else do you learn but by asking questions?