In ∆ABC, AB = (2 – x) cm, BC = (x + 1) cm and angle ABC = 120˚:
a) Show that AC^2 = x^2 – x +7.
b) Find the value of x for which AC has a minimum value.
I’ve done 1st part. But how can I solve 2nd part. Please help me.
In ∆ABC, AB = (2 – x) cm, BC = (x + 1) cm and angle ABC = 120˚:
a) Show that AC^2 = x^2 – x +7.
b) Find the value of x for which AC has a minimum value.
I’ve done 1st part. But how can I solve 2nd part. Please help me.