Prove that the value of the expression a^2–a is divisible by 2 for any whole value of a.

need quickly plz, plz.

Note that , so that is the product of two consecutive integers. This means one of them must be even, and the other is odd. The product of an odd number and an even number is itself an even number, so for any integer .

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong