Question

how do i solve this??

Answer 1

i just want to understand how its possible to figure out wheter an integral is positive or negative or zero without any calculations

Answer 2

@turingtest

Answer 3

@myininaya

Answer 4

@satellite

Answer 5

#1 - "B" is the Unit Circle,Quadrants III and IV. All y-values are negative. Even powers of y are ALWAYS positive. The result must be positive.

#3 Almost the exact same argument as #1. Even exponents are wild.

#4 Almost the same argument, but now we have odd functions of 'y'. It's positive on one side of the x-axis and negative on the other. Where does that leave us?

#2 - Let's see what you can argue about this one.

Answer 6

is number 2 zero because in quad 1 x and y are positive but in quad 2 x is negative
the two cancel each other

Answer 7

Right. 'y' fails to contribute much of interest as it is ALWAYS positive. 'x' is the more significant. I think you have it!

Good work.

Answer 8

lol

Answer 9

ohh and 4 is zero too =)

Answer 10

tanx for your help=)

Answer 11

:-) Just a little warning, the abbreviation "tanx" is okay in most environments, but in a math forum, it could be misconstrued. {chuckle}

Answer 12

lolLL !