Answers

2016-08-04T21:49:28+08:00
2(x)(x+2)=2x^2+4x
2(5)(x+2)=10x+20
2(5)(x)= 10x
add the expressions
2x^2+4x+10x+20+10x=236
simply the quadratic equation (combine like terms)
2x^2+24x+20=236
get the roots
x=6 x=-18 discard the negative root. (there is no such negative measurement)
6 will be our x
X=6
Checking:
x=6
length= x+2
width= x
height= 5
subsitute
length (6)+2=8
width (6)
height (5)
TSA= 2lw+2wh+2lh
2(8)(6)=96
2(6)(5)=60
2(8)(5)=80
96+60+80=236cm^2
hope this helps lol
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