Answr:
a) x²-49 = 0 b) x²-81 = 0 c) 10x²- 40 = 0
Solucion:
RTA:
a)x=7,x=-7
b) x²-81 = 0:x =9,x=-9
c)10x²- 40 = 0 :x =2,x=-2
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