Oblicz watość wyrażenia a) (x+1)(x-1)+(x+2)(x-2)-(x+3)(x-3) dla x=√3 b) (1-2x)(1+2x)+(1-3x)(1+3x)-(1-4x)(4x+1) dla x=√5 c)(2x-1)²-(2x-1)(1+2x)-(2x+1)² dla x=√2

a) (x+1)(x-1)+(x+2)(x-2)-(x+3)(x-3)= =x²-1+x²-4-x²+9= =x²+4= --- x=√3 --- =√3²+4= =3+4= =7 ---------------------------------- b) (1-2x)(1+2x)+(1-3x)(1+3x)-(1-4x)(4x+1)= =1-4x²+1-9x²-1+16x²= =3x²+1= --- x=√5 --- =3*√5²+1= =3*5+1= =16 ---------------------------------- c)(2x-1)²-(2x-1)(1+2x)-(2x+1)²= =4x²-4x+1 - 4x²+1 - 4x²-4x-1= =-4x²-8x+1 --- x=√2 --- =-4*√2²-8√2+1= =-4*2-8√2+1= =-7-8√2