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X²-(x²+2x-3x-6)=8
X²-(x²-x-6)=8
X²-x²+x+6=8
X=2
39) 3x²-(x-1)(x+5)=2x²+3
3x²-(x²+5x-x-5)=2x²+3
3x²-x²-4x+5=2x²+3
2x²-4x+5=2x²+3
5-3=4x
X=2/4
X=½
40) - (4-x)(x+3)=x²-40
- (4x+12-x²-3x)=x²-40
-(-x²+x+12)=x²-40
X²-x-12=x²-40
40-12=x
X=28