Решите уравнение x²+2x-7=0

2x²-4x-1=0

x²+6x+3=0

2x²-10x+1=0

X²+2x-7=0

D=2²-4 * (-7) = 4+28=32

√D=√32=4√2

x = (-2+4√2) / 2=2√2-1

x = (-2-4√2) / 2=-1-2√2

2x²-4x-1=0

D=4²-4*2 * (-1) = 16+8=24

√D=√24=2√6

x = (4+2√6) / 2*2=1+√6/2

x=1-√6/2

x²+6x+3=0

D=6²-4*3=36-12=24

√D=√24=2√6

x = (-6+2√6) / 2=√6-3

x = (-6-2√6) / 2=-3-√6

2x²-10x+1=0

D=10²-4*2=100-8=92

√D=√92=2√23

x = (10+2√23) / 2*2 = (5+√23) / 2

x = (5-√23) / 2