2x² - 3x + 2 = ( 2x - 2)²
2x² - 3x + 2 = 4x² - 8x + 4
2x² - 4x² - 3x + 8x + 2 - 4 = 0
- 2x² + 5x - 2 = 0
2x² - 5x + 2 = 0
D = b² - 4ac = 25 - 4×2×2 = 25 - 16 = 9 = 3²
x1 = ( 5 + 3) / 4 = 2
x2 = ( 5 - 3) / 4 = 2/4 = 0,5
14dk-21c
,.......,........,....,,
Log15^2/log15=2*log15/1og15=2
y=ax^2+bx
-3=a*2^2+b*2
4=a*1^2+b*1
4a+2b=-3
a+b=4 => a=4-b
4*(4-b)+2b=-3 => 16-4b+2b=-3 => -2b=-19 => b=9,5
a=4-b => a=4-9,5=-5,5
y=-5,5*x^2+9,5