ax² +bx + c = a (x -x₁)(x - x₂)
1) 10х² + 29x - 30 = 10·(x -(-29-√2041)/20 )·(x -(-29+√2041)/20 )
D = 29²-4·10(-30)=841+1200=2041
x₁=(-29-√2041)/20 x₂=(-29+√2041)/20
2) 5х²- 30х + 35 = 5 ·( x -3+√2 )·(x - 3-√2)
D= (-30)²-4·5·35=900-700=200
x₁=(30-10√2)/10=3-√2 x₂=(30+10√2)/20=3+√2