Prove that if m^2 - n^2 is even, then m - n is even also.

Step-by-step explanation:

Given

is even i.e.

it is a multiple of 2

let us suppose it 2k

and we know that it is possible only when either both m&n is odd or even

i.e.

=even number

=odd number

thus m-n is even for both case i.e. for both m&n either odd or even

no, the equation would be invalid since they are both not equal.

step-by-step explanation:

here you got

4y-6+4y 2-9

first, you would simplify the equation on the form.

4y-6+4y 2-9

then, move all the terms that contains a y to the left and all the other terms to the right.

+4y-4y+-9-6

finally, you will simplify the left and the right side of the equation.

y=-3

step-by-step explanation: