Question

Chapter 12
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Let's Think Along
1 6 x 6-55 = 6 + 5-11
7x7 - 6x6 = 7+ 6 = 13
A bake had to kg of flows. He Paked some of the
floor an g fackets. Each packet has a weight of 4.25
was not hacked
kg flow flour
230​

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.