SOLUTION: when you are finding the surface area of a rectangular prism and you hav to find the polynomial in simplified form how do you get the answer? Because on the rectangular prism- the

Question 2352: when you are finding the surface area of a rectangular prism and you hav to find the polynomial in simplified form how do you get the answer? Because on the rectangular prism- the length and width is x+5 and the height is 3x-1 and i got 66x+-10 +12x squared and i think i did something wrong but i cant find out where? Pllleaase help asap, thankss!
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
surface area...6 faces, 2 of each combination...
2((x+5)(x+5)) + 2((x+5)(3x-1)) + 2((x+5)(3x-1))
= 2((x+5)(x+5)) + 4((x+5)(3x-1))
= 2() + 4()
=
so = 0

(7x + 3)(x + 5) = 0
so 7x+3=0 OR x+5=0
so, x=-3/7 or x=-5
jon

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