1. х¹= 6 х²=-1
2. х¹=8 х²=5
3. 7x²+12x+5=0
D= 144 - 4*5*7=4
x1= (-12+4)/2*7 = -4/7
x2= (-12-4)/2*7 = -8/7
x²+4x-5=0
x¹=-5 x²= 1
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Answers & Comments
1. х¹= 6 х²=-1
2. х¹=8 х²=5
3. 7x²+12x+5=0
D= 144 - 4*5*7=4
x1= (-12+4)/2*7 = -4/7
x2= (-12-4)/2*7 = -8/7
x²+4x-5=0
x¹=-5 x²= 1