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5x-3x=4+2
2x=6 /:2
x=3
b) 2x(x+3) - (x^2+4)=0
2x^2 + 6x - x^2 -4=0
x^2 + 6x - 4=0 liczymy delte
delta=6^2 + 4*4= 52 pierwiastek z delty to pierwiastek z 52 czyli 2 pierwiastki z 13
x1= (-6+2pier.z13):2=-3 + pierwiastek z 13
x2= (-6-2pier.z13):2=-3 - pierwiastek z 13
c) 2(x+1)^2 - (3x+1)(x-2)=0
2(x^2+2x+1) - (3x^2 - 6x + x -2)=0
2x^2 +4x +2 - 3x^2 +5x +2=0
-x^2 + 9x + 4=0
delta= 81 + 16=97
x1=(-9 - pierwiastek z 97): (-2)
x2=(-9 + pierw, z 97) : (-2)