Which of the following is a perfect square trinomial? O A. 25x2 - 30xy +9y2
O B. 25x2 + 16xy - 9y2
O C. 25x2 - 16xy + 9y2
O D. 25x2 + 30 xy - 9y2
What is the answer I can’t find it

1. sometimes

2. never true

3. sometimes

step-by-step explanation:

these are pretty self explanatory if you know what supp right and com angles are

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

m∠a is 90°

m∠b is 40°

the answer is 8/21

hope this