1.If the difference between the roots of 4x^2+2kx-5=0 is 3,find the possible value(s) of k.
2.Form a quadratic equation in x whose roots are half the roots of 4x^2-x-8=0
3.It is given that 1/ａ and 1/Ｂ are the roots of the quadratic equation 4x^2-7x+1=0
(a)Find the values of ａＢ and ａ+Ｂ
(b)Form a quadratic equation in x whose roots are ａ and Ｂ
4.If ａ and Ｂ are the roots of the quadratic equation x^2-8x-2=0,form a quadratic equation in x whose roots are ａ^2/2 and Ｂ^2/2

謝解笞

1. 4x^2+2kx-5=0
a=4
b=2k
c=-5
用delta式(b^2-4ac)搵k
2.搵左4x^2-x-8=0個答案先
除2再自己砌條式出黎,個x要係個答案既一半
3.
(a)搵 4x^2-7x+1=0個答案,再做佢要你做既野
(b)作條式出黎,個x要係=a同b
4.搵a同b係x^2-8x-2=0既答案,之後做佢要你做既野
最後作一條quadratic equation