Evaluate the expression 3xy - 2x^2 for x=4 and for y = 3

Good evening my friend.

The first  thing we need to thing about is to replace each values by the number that they give for them. 

So let's start by replacing 4 every where we see x and 3 everywhere there is y

3(4)(3) - 2(4)²

36 - 2(16)

36- 32

= 4

I hope that's help :) 

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this