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Misalkan 2^x= a
2^x. 2^x - 2^x.2 > 8
a^2-2a-8 > 0
(a-4)(a+2) > 0
a < -2 atau a > 4
substitusikan
2^x < -2 (tm)
2^x > 4
2^x > 2^2
x > 2
Bilangan yg menjadi pangkat dari 3 dan dari 7 hanya sama jika bilangan itu 0 karena 3^0=7^0= 1
x^2-x-2=0
(x-2)(x+1)=0
x1= 2
x2= -1
x1+x2= 2-1= 1
x+1=0
x= -1
x^2+3x-1 > x^2-2x+4
5x > 5
x > 1
y= x^2+1
y+x^2=1
y= -x^2+1
x^2+1= -x^2+1
2x^2=0
x= 0