Question

how is the symbol changing in last step

Answer 1

Hola User_____________

Here is Your Answer......!!!!!
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☆Actually welcome to the concpet of Inequalities. ...

☆Basically if we broadly observe ..here....
the concept is that ...Inequality always reverse or change its direction ..when there is multiplication of negative sign on the RHS AND LHS of the inequality....

☆Let's consider a example :-
we know that

4 < 5 .....

☆but actually....

-4 > -5....

☆So there reverse in inequality sign..

☆According to the question ..

16 - 4k > 0
===>
-4k > -16

☆multiplying by negative sign ...

4k < 16

☆so here ....

k < 4....
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Hope it helps u.....☺