Posted by Jack on Wednesday, September 8, 2010 at 9:33pm.
Determine the coordinates of the point (xy) where the curves y=(12)x−5 and y=x2+2x−15 intersect in the third quadrant

Pre Calculus  Henry, Thursday, September 9, 2010 at 12:02pm
y = 12x  5. y = x^2 + 2x  15.
Substitute 12x  5 for y in the 2nd Eq:
12x 5 = x^2 + 2x 15,
Solve for x,
12x  x^2  2x = 15 + 5,
Combine liketerms:
x^2 + 10x + 10 = 0,
Multiply each side by 1:
x^2  10x  10 = 0,
Use quadratic formula to solve for x:
x = (10 + sqrt(100+40)) / 2,
x = 10.92 , 0.916,
x = 0.916(3rd quadrant).
Substitute 0.916 for x in 1st Eq:
y = 12 * 0.916  5 = 16.
P(0.916 , 16)

Pre Calculus  WxQzhymD, Saturday, September 12, 2015 at 5:36pm
only go for it if u feel ur ready. if u can understand the ap callucus book well then u should go for it without any pressure. since school doesn't start till fall then maybe u can take a math class over the summer so if u can understand all of what I've learned or feel that you have closed that big gap that u were talking about then u can decide what u want 2 do. just follow ur heart. no one will judge u all that matters is that u r dedicated,mathematically inclined,and r not afraid 2 open new doors.
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