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x la puterea 2 - 225
49 x la puterea 2 - 144
(2x+3) la puterea 2 - x la puterea 2
AJutor


Răspuns :

2x-45098x - 144= 45098x - 144
prima e :( x-15)(x+15)
a doua e: (7x-12)(7x+12)
a treia e : 4x la puterea 2+12x+9-x la puterea 2
=3x la putera2+12x+9
D=b la puterea 2 -4ac
D=144-4*3*9=144-108
D=36
x1,2=-b plus , minus radical din delta
x1=-12+6/6=-6/6=-1
x2=-12-6/6=18/6=3