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x^2=9
x^2-9=0
(x-3)(x+3)=0
x=3
x=-3
b)x^2=1/4
x^2-1/4=0
(x-1/2)(x+1/2)=0
x=1/2
x=-1/2
c)x^2+x-56=0
(x+8)(x-7)=0
x=-8
x=7
d)no se puede factorizar
por tanto aplicamos
x=(-b+raiz(b^2-4ac))/2a x=(-b-raiz(b^2-4ac))/2a
a=1
b=-1
c=-26
x=[1+raiz(1-4(1)(-26)))]/2(1) x=[1-raiz(1+4*26)]/2
x=[1+raiz(105)]/2 x=[1-raiz(105)]/2
x=5.62 x=-4.62
e)x(x-13)=0
x=0
x=13
f)x^2+9x=0
x(x+9)=0
x=0
x=-9