1. 5x(x-3)²-5(x-1)³+15(x+2)(x-2)=5
5x(x²-6x+9)-5(x³-3x²+3x-1)+15(x²-4)=5
5x³-30x²+45x-5x³+15x²-15x+5+15x²-60=5
30x-55=5
30x=60
x=2
2. (x+2)³-x(3x+1)²+(2x+1)(4x²-2x+1)
x³+6x²+12x+8-x(9x²+6x+1)+8x³+1
x³+6x²+12x+8-9x³-6x²-x+8x³+1
11x+9
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Answers & Comments
1. 5x(x-3)²-5(x-1)³+15(x+2)(x-2)=5
5x(x²-6x+9)-5(x³-3x²+3x-1)+15(x²-4)=5
5x³-30x²+45x-5x³+15x²-15x+5+15x²-60=5
30x-55=5
30x=60
x=2
2. (x+2)³-x(3x+1)²+(2x+1)(4x²-2x+1)
x³+6x²+12x+8-x(9x²+6x+1)+8x³+1
x³+6x²+12x+8-9x³-6x²-x+8x³+1
11x+9