Explicație pas cu pas:
1.(8x-3)^2=64x^2-48x+9.
2.3x+5y-7,5x-8,12y=-4,5x-3,12y.
3.a)-2x(3xy-5y)=-6x^2y+10xy.
b)(5x+3)^2=25x^2+30x+9.
c)(4a-7)(4a+7)=16a^2-49.
d)(2x^2)^3×14x^2=8x^6×14x^2=112x^8.
