Answer:
CD = 4² - 3 - 11
BC = 3² + 11 - 12
Perimeter = 5³ + 24² + 6 - 38
Explanation:
To get CD, Subtract AB from FE.
- CD = 2x³ + 4x² - 5x - 7 -*(2x³-2x+4)
- CD = 2x³+4x²-5x-7-2x³+2x-4
- CD = 4x²-3x-11
NB : For easiness, add (-1) rather than (-).
To get BC, subtract DE from FA
- BC = 8x²+5x-12-(5x²-6x)
- BC = 8x²+5x-12-5x²+6x
- BC = 3x²+11x-12
To get the perimeter, Add all sides.
- 2x³+4x²-5x-7+3x²+11x+12+4x²-3x-11+5x²-6x+2x³-2x+4+8x²+5x-12
- 5x³+24x²+6x-38