Question

what should be subtracted from 3xy²-4y²+5xy+20 to obtain -x²-y²+6xy+20?​

Answer 1

Answer:

The terms 'wastewater' and 'sewage' are regularly used interchangeably, however there are differences between both. In fact, 'sewage' is considered a subset of wastewater. ... There are two types of sewage: blackwater, or wastewater from toilets, and graywater, which is wastewater from all domestic sources except toilets.

Answer 2

Answer:

$3xy ^{2} - 4y ^{2} + 5xy + 20 - | - x ^{2} | - y ^{2} + 6xy + 20 = 2xy^{2} - 3y ^{2} - + 11xy + 40$