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sswaqqin
04.02.2020 •
Mathematics
100 brainliest if correct
write and simplify a polynomial expression for the surface area of each figure.
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Ответ:
SA = 16x^2 +30x+6
Step-by-step explanation:
The surface area is given by
SA = 2 (lw + lh + wh)
The length is 2x, the width is (x+3) and the height is (2x+1)
SA = 2 ((2x)*(x+3) + (2x)*(2x+1) + (x+3) (2x+1))
We need to distribute
SA = 2 ((2x^2+6x) + (4x^2+2x) + (2x^2 +6x+x+3))
Combine like terms
SA = 2 (2x^2+ 4x^2+2x^2+6x+2x +6x+x+3)
SA = 2 (8x^2+15x+3)
Multiply by 2
SA = 16x^2 +30x+6
Ответ:
Step-by-step explanation:
Surface area = sum of all six faces
=2(2x)(x+3) + 2(2x)(2x+1) + 2(x+3)(2x+1)
=4x^2+12x + 8x^2+4x + 4x^2+14x+6
=16x^2 + 30x + 6
Ответ:
Step-by-step explanation:
1) If the diameter is included:
2(4)*pi/2+2(4)
4pi+8
2)If it isn't included
2(4)*pi/2
4pi