Question

(case). If he sells the cell phone for 2,500, find his profit or loss per cent
4. A man buys 5 dozen eggs at ? 36 per dozen. Out of which 5% got broken. Her
remaining eggs for 48 per dozen. What was his total gain?
5. Rahul buys an almirah for 2,000 and spends ? 400 as its transportation charges
sells the almirah for 3,000, determine his profit per cent.
We have learnt how to find profit (or loss) and profit % (or loss %) if C.P. and S.P. of ana
is known.
Note:
We can also find S.P. of an article if C.P. is known and vice-versa, provided profits
or loss % is given
Let us explain this with the help of examples
3. A man purchased a cell phone for 2,000. By paying * 200 more, he replacesitas​

Answer 1

Answer:

This implies that

x2+2ax=4x−4a−13

or

x2+2ax−4x+4a+13=0

or

x2+(2a−4)x+(4a+13)=0

Since the equation has just one solution instead of the usual two distinct solutions, then the two solutions must be same i.e. discriminant = 0.

Hence we get that

(2a−4)2=4⋅1⋅(4a+13)

or

4a2−16a+16=16a+52

or

4a2−32a−36=0

or

a2−8a−9=0

or

(a−9)(a+1)=0

So the values of a are −1 and 9.