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#425 to #75
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psykobear (03/16/2013) [-] x^2 + 4x - 21 = 0 (Universe = Natural Numbers)
Quadratic Formula: (-b +/- (b^2 - 4ac)^(1/2)) / 2a
x = (-4 +/- (4^2 - 4(1)(-21))^(1/2)) / 2(1)
x = (-4 +/- (16 - (-84))^(1/2)) / 2
x = (-4 +/- 100^(1/2)) / 2
x = (-4 +/- 10) / 2
x = -6/2 or 6/2
x = -3 or 3
Only Natural Numbers, so:
x = 3
Half Life 3 confirmed
Quadratic Formula: (-b +/- (b^2 - 4ac)^(1/2)) / 2a
x = (-4 +/- (4^2 - 4(1)(-21))^(1/2)) / 2(1)
x = (-4 +/- (16 - (-84))^(1/2)) / 2
x = (-4 +/- 100^(1/2)) / 2
x = (-4 +/- 10) / 2
x = -6/2 or 6/2
x = -3 or 3
Only Natural Numbers, so:
x = 3
Half Life 3 confirmed
