What is the sign of − x − y −y −x start fraction, minus, x, divided by, minus, y, end fraction when x > 0 x> 0x, is greater than, 0 and y > 0 y> 0y, is greater than, 0? choose 1 choose 1 (choice a) a positive (choice b) b negative (choice c) c zero

Option A - Positive

Step-by-step explanation:

Given : Expression when

To find : What is the sign of the expression ?

Solution :

Expression

when

We know that,

When a negative unit is divided by a negative unit then the negative sign became positive sign as negative sign get cancel in numerator and denominator.

So,

The sign of expression is positive.

Therefore, option A is correct.

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680