Question

упростите выражение:а)(z-7)(z+1)-(z+3)^2 б)2(3k-l)^2+12kl в)y^3+(5-y)(25+5y+y^2)

Answer 1

а) z^2 - 7z + z - 7 - (z^2 + 6z +9) = - 12z - 16 = - 4(3z - 4)
b) 2(9k^2 - 6kl + l^2) + 12kl = 2(9k^2 - 6kl + l^2 + 6kl) = 18k^2 + 2l^2
c) y^3 + 125 + 25y +5y^2 - 25y - 5y^2 - y^3 = 125

Answer 2

а)(z-7)(z+1)-(z+3)^2 =z²+z-7z-7-z²-6z-9=-12z-16
б)2(3k-l)^2+12kl =18k²-12kl+2l²+12kl=18k²+2l²
в)y^3+(5-y)(25+5y+y^2)=y³+125-y³=125