zad.1 uprosc wyrazenie
c)7(z^2-2)-4(z+3)(z-3)
d)10(a^2-15)-12(a-4)(a+4)
e)2(a-b)^2-2(a+b)^2+(a+b)(a-b)
zad.2 rozwiąz równania:
a)(x-1)^2-(x+4)^2=-2x+1
b)(x+5)^2-(x-3)^2=x+1
c)(x+1)^2+(x-3)(x+3)-2=2(x-1)^2
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1)
c)...=7z²-14-4z²+36=3z²+22
d)...=10a²-150-12a²+192=-2a²+42
e)...=2a²-4ab+2b²-2a²-4ab-2b²+a²-b²=
= a²-b²-8ab
2)
a) x²-2x+1-x²-8x-16=-2x+1
-2x-8x+2x=1-1+16
-8x=16 /:(-8)
x=-2
b) x²+10x+25-x²+6x-9=x+1
10x +6x-x = 1-25+9
15x=-15 /:15
x=-1
c) x²+2x+1+x²-9-2 =2x²-4x+2
2x+4x = 2-1+9+2
6x=12 /:6
x=2