Question

0
1 cm
(e)
2. The lid of a rectangular box of sides 40 cm by 10 cm is seale
What is the length of the tape required?
3. A table-top measures 2 m 25 cm by 1 m 50 cm. What is
table-top?
4. What is the length of the wooden strip required to frame a
and breadth 32 cm and 21 cm respectively?
A rectangular piece of land measures 0.7 km by 0.5 k
fenced with 4 rows of wires. What is the length of the wटेबल टॉप ​

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.