y = 3x²+4x -2
a) put y=0 and find the discriminant,
b) hence determine the number of x-intercepts in the graoh of the given equation.
Answer : a) 40 , b) 2
please help me !!!
MATHS... help! help! help!
2007-03-17 3:18 am
回答 (2)
2007-03-17 3:24 am
✔ 最佳答案
(a) 3x²+4x -2 = 0Discriminant = (4)^2 - 4(3)(-2) = 16+24 = 40
(b) Because the discriminant is greater than zero, so the equation has two real roots, which means that it has two x-intercepts
2007-03-17 6:33 pm
y = 3x²+4x -2
a) 3x^2+4x-2=0
D/4=4+6=10>0
b)Therefore, there are 2 points of intersectionon the x intersept.
a) 3x^2+4x-2=0
D/4=4+6=10>0
b)Therefore, there are 2 points of intersectionon the x intersept.
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