4.z²+1-(1+z)²
5.(х-2)²+(х-5)(х+7)
6.3(а-1)²+8а
7.y(y+2x)-(x+y)²
8.(b+4)²-(b-3)²
Упростите выражения
5.(х-2)²+(х-5)(х+7)
6.3(а-1)²+8а
7.y(y+2x)-(x+y)²
8.(b+4)²-(b-3)²
Упростите выражения
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Answers & Comments
5. x^2-4x+4+x^2+7x-5x-35=2x^2-2x+4=2(x^2-x+2)
6. 3(a^2-2a+1)+8a=3a^2-6a+3+8a=3x^2+2a+3
7. y^2+2xy-x^2-2xy-y^2=-x^2
8. b^2+8b+16-b^2+6b-9=14b+7=7(2b+1)