Answer:
To subtract (9x-4)(9x-4) from (7x-2)(7x-2), we need to expand both of them and then subtract. Using the formula (a-b)^2 = a^2 - 2ab + b^2, we get:
(7x-2)(7x-2) - (9x-4)(9x-4)
= (49x^2 - 28x + 4) - (81x^2 - 72x + 16)
= 49x^2 - 28x + 4 - 81x^2 + 72x - 16
= -32x^2 + 44x - 12
Therefore, the expression which represents the difference when (9x-4)(9x−4) is subtracted from (7x-2)(7x−2) is -32x^2 + 44x - 12.