Question

Упростить выражения: 1.(х-3)²-х(х-6) 2.(m+5)²-(m-5) 3.1-(2a-1)² 4.z²+1-(1+z)2

Answer 1

1.-x2+7x-9 2.-m3-15m2-75m-125

Answer 2

1.x^2-6x+9-x^2+6x=9
2.m^2+10m+25-m+5=m^2+9m+30
3.1-4a^2+4a-1=4a-4a^2
4.z^2+1-2-2z=z^2-2z-1