Answer:
(1)The error is in third step.
The correct solution is (x-5)²
(2)The error is in third step.
The correct solution is (4c+3)(4c-c)
Step-by-step explanation:
(a-b) whole square is the sum square of a and b and subtraction of product of 2,a and b.
(a-b) = a²+b²-2ab
Therefore,
x²-10x+25
=x²-2.x.5+5²
=(x-5)²
The error is in third step.
The correct solution is (x-5)²
The subtraction of square of b from square a is the product of sum of a and b and the subtraction a from b.
(a²-b²)=(a+b)(a-b)
16c²-9
=(4c)²-3²
=(4c+3)(4c-c)
The error is in third step.
The correct solution is (4c+3)(4c-c)