You Know That

We know that
-6 = -6
And
9-15 = 4-10
Add 25/4 2 both sides
9+25/4-15 = 4+25/4-10
We knw that
” ['a' square - 2ab + 'b' square] = (a-b)square ”
So here, 4 left hand side,
a=3, b=5/2
And
4 right hnd side,
a=2, b=5/2
Put these values in eq.
Expres that eq as:
(3 – 5/2) (3 – 5/2) = (2-5/2) (2-5/2)
Taking square root of both sides,
3 [...]