Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
d = |Ax1 + By1 + C| / √(A² + B²)
d = √(A² + B²)
d = |Ax1 + By1| / C
d = (Ax1 + By1)²
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.