nyaaawallace
nyaaawallace
22-03-2017
Mathematics
contestada
x^2 + 18x + c = 25 +c
Respuesta :
Abu99
Abu99
22-03-2017
Rearrange to: x^2 + 18x - 25 = 0
Then factorise (I like to do it by completing the square):
(x + 9)^2 -81 -25 = 0
(x + 9)^2 = 106
x + 9 = sqrt(106)
The sol'ns are:
x = -9 + and - sqrt(106)
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