quaddi
quaddi
04-03-2015
Mathematics
contestada
What are the roots of the equation y=x squared +x-42
Respuesta :
Panoyin
Panoyin
04-03-2015
y = x² + x - 42
x² + x - 42
x =
-1 +/- √(1² - 4(1)(-42))
2(1)
x =
-1 +/- √(1 + 168)
2
x =
-1 +/- √169
2
x =
-1 +/- 13
2
x =
-1 + 13
x =
-1 - 13
2 2
x =
10
x =
-14
2
2
x = 5 x = -7
-----------------------------------------------------------------------------------------------
y = x² + x - 42 y = x² + x - 42
y = (5)² + 5 - 42 y = (-7)² + 5 - 42
y = 25 + 5 - 42 y = 49 + 5 - 42
y = 30 - 42 y = 54 - 42
y = -12 y = 12
(x, y) = (5, -12) y = (-7, 12)
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