解不等式:2(X+3)(x-3)

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解不等式:2(X+3)(x-3)

解不等式:2(X+3)(x-3)
解不等式:2(X+3)(x-3)

解不等式:2(X+3)(x-3)

2(X+3)(x-3)<(x+1)²-3X
2(x²-9)2x²-182x²-x²+x<1+18
x²+x<19
x²+x+1/4<19+1/4
(x+1/2)²<77/4
-√77/2(-1-√77)/2


2(x+3)(x-3)<(x+1)²-3x
2x²-18<x²-x+1
x²+x-19<0
x²+2×(1/2)x+(1/2)²-(1/2)²-19<0
(x+1/2)²<77/4
-(√77)/2<x+1/2<(√77)/2
-(1+√77)/2<x<(-1+√77)/2