lexi02238
lexi02238
07-08-2017
Mathematics
contestada
x^2-9x-36=0, how do I solve this
Respuesta :
kphung76127
kphung76127
07-08-2017
Factor it out.
(x-12)(x+3)
Proof:
-12+3=-9
-12*3=-36
To find zeros:
x-12=0
x=12
x+3=0
x=-3
Final answers for roots: {-3, 12}
Answer Link
Banabanana
Banabanana
07-08-2017
x² - 9x - 36 = 0
x² + 3x - 12x - 36 = 0
x(x+3) - 12(x + 3) = 0
(x+3)(x-12) = 0
x+3 = 0 or x-12 = 0
x = -3 x = 12
Answer: x=-3, x=12
Answer Link
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