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A(a-2)-a^2>5-3a
3x(3x-1)-9x^2<3x+6
5y^2-y(y+4)≧100
7c(c-2)-c(7c+1)<3
A(a-2)-a^2>5-3a
3x(3x-1)-9x^2<3x+6
5y^2-y(y+4)≧100
7c(c-2)-c(7c+1)<3
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Answers & Comments
a^2-2a-a^2>5-3a
-2a+3a>5
a>5
3x(3x-1)-9x^2<3x+6
9x^2-3x-9x^2-3x<6
-6x<6
x>-1
5y^2-y(y+4)≥100
5y^2-y^2-4y≥100
4y^2-4y-100≥0
y^2-y-25≥0
7c(c-2)-c(7c+1)<3
7c^2-14c-7c^2-c<3
-15c<3
-c<3/15
c>-1/5