Question

Rezolvati va rog : x²-7x+12=0
x²+11=4x
x²-2x-3=0
x²-3x=88

Answer 1

x²-4x+11=0
d = b² - 4 * a * c
d = (-4)² - 4* 1 * 11
d = 16 -44
d= -28
d < 0 ecuatia nu are solutii

x²-2x-3=0

d = b² - 4 * a * c
d = (-2)² - 4 * 1 * (-3)
d = 4 + 12 = 16
x1,2 = -b + sau - radical din delta
x1,2 = 2 + 4 / 2 = 6 / 2 = 3
2 - 4 / 2 = -2 /2 = -1

x1= 3 solutie

x²-3x-88=0

(-3)^2-4*1*(-88)
 
9+352=361