Хелп плес

X²+4x+4=0

x²+8x+7=0

2x²+3x+1=0

3x²--3x+4=0

4x²+10x-6=0

100x²-160x+68=0

1. x^2-4x+4=0

d=16-4*1*4=0

x=4/2

x=2

2. x²-8x+7=0D=b²-4ac = (-8) ²-4*1*7=64-28=36

x1 = (-b+√D) / 2a = ( - (-8) + 6) / 2*1 = (8+6) / 2=7

x2 = (-b-√D) / 2a = (-8) - 6) / 2*1 = (-14) / 2=-7

Ответ: х=7

3. нинаю

4.