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Thanx but for q5 how did it becum 6x^2?Q5(ii)
6x+k = 7√x
Let y = √x
6x^2 - 7y + k = 0
b^2 - 4ac = 0 (Since its a tangent)
(-7)^2 - 4(6)(k) = 0
k = 49/24
Q8(i)
x^2 - 4x + k
= x^2 - 4x + (-2)^2 - (-2)^2 + k
= (x - 2)^2 - 4 + k
n plz plz if u can ans d other 2 questions (2012 may-jun p12 q4 n q10) also