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Q: What is the electron configuration of iron? A. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d9 B. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6 C. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6 D. 1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d8
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Use the quadratic formula to solve 4y2 + 8y + 7 = 4.
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Updated 6/6/2014 12:03:08 AM
4y^2 + 8y + 7 = 4
4y^2 + 8y + 7 - 4 = 0
4y^2 + 8y + 3 = 0
a = 4, b = 8, c = 3
b^2 - 4ac = 8^2 - 4(4)(3) = 64 - 48 = 16
x = (-8 ± sqrt 16)/8
= (-8 ± 4)/8
x = -1/2 or x = -3/2
Confirmed by andrewpallarca [6/6/2014 10:44:45 AM]
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