Answer:
a)
Step-by-step explanation:
Given: Step 3
(JK)² = LK · MK and (LJ)² = LK · ML
Step 4
Addition property of equality
(JK)² + (LJ)² = LK · MK + LK · ML
Step 5
Distributive property
(JK)² + (LJ)² = LK (MK + ML)
Option A
addition property of equality
So
And
Distributive property
Hence option A is correct