Procedimiento
x 2-8x+15=0
a+b=-8 ab=15
-1,-15 -3,-5
-1-15=-16 -3-5=-8
a=-5 b=-3
(x-5) (x-3)
Respuesta:
x=5
x=3
x 2 - 4 x - 77 = 0
a+b=-4 ab=-77
1,-77 7,-11
1-77=-76 7-11=-4
a=-11 b=7
(x-11). (x-7)
x=11
x=7
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Verified answer
Procedimiento
x 2-8x+15=0
a+b=-8 ab=15
-1,-15 -3,-5
-1-15=-16 -3-5=-8
a=-5 b=-3
(x-5) (x-3)
Respuesta:
x=5
x=3
Procedimiento
x 2 - 4 x - 77 = 0
a+b=-4 ab=-77
1,-77 7,-11
1-77=-76 7-11=-4
a=-11 b=7
(x-11). (x-7)
x=11
x=7