1/a and 1/b are the roots of quadratic equation 4x^2-7x+1=0
find the value of ab and a+b
maths F.4 quadratic equation
2009-09-30 2:44 am
回答 (1)
2009-09-30 2:47 am
✔ 最佳答案
4x^2-7x+1=0Product of roots
= 1/a * 1/b = 1/4
ab = 4
Sum of roots = (1/a)+(1/b) = -(-7/4) = 7/4
(a+b)/ab = 7/4
a+b = (7/4)*4
a+b = 7
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