Tolong dibantu Kak plissss

9b²-16c²/15b-20c
=(3b+4c)(3b-4c)/5(3b-4c)
=3b+4c/5

48x+72y/64x²-144y²
=6(8x+12y)/(8x+12y)(8x-12y)
=6/8x-12y

semoga bisa membantu...