Question

if s+t =3 and s-t =√5 then find the value of st​

Answer 1

Answer :-

The value of st = -1.292

Step by step explanation:-

In context to the question
We have to find the value of s t

Given equation,
s+t = 3. (Eq.1)
s-t =√5. (Eq.2)

For Eq. 1
s+t=3
t =3-s. [Eq. 3]
Putting the value of t in [Eq.2]
s-t = √5
s -(3-s) = √5
s-3+s = √5
By transposing method
2s-3 = √5
2s = √5 -3
s = (√5-3)/2 = -0.381

Putting the value of s in [Eq. 3]
t = 3- (√5-3)/2
t = (6-√5+3)/2
t = (9-√5)/2
t = ( 9-2.23) /2
t = 6.77/2
t= 3.385

The value of s x t
= -0.381 x 3.385
= -1.292

The value of st = -1.292