Final answer:
The value of the expression (m² + 4) - n² when m = -4 and n = 6 is -16.
Step-by-step explanation:
To evaluate the expression (m² + 4) - n² with given values of m and n, substitute m = -4 and n = 6 into the expression:
(-4² + 4) - 6²
= (16 + 4) - 36
= 20 - 36
= -16
Therefore, the value of the expression (m² + 4) - n² when m = -4 and n = 6 is -16.
Learn more about Evaluating expressions with given values