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Va rog e urgent:
(x+3)(x-7)=0
Multumesc.


Răspuns :

(x+3)(x-7)=0
x+3=0
x=0-3
x=-3

x-7=0
x=0+7
x=7
[tex] x^{2} [/tex]-7x+3x-21=0
[tex] x^{2} [/tex]-4x-21=0
a=1
b=-4
c=-21
Δ=[tex] b^{2} [/tex]-4ac
Δ=16+84=100
x1=(-b+√Δ)/2a
x1=(4+10)/2=7
x2=-6/2=-3