Question

-3² = -1*3² = -1 * 9 = -9 (order of operations) while (-3)² = (-3)(-3) = +9 or 9

Evaluate: Z2 – X2 -XY if X = -2, Y = 3, and Z = -4 (please see section 1.8 for further review)

Answer 1

Answer: 20

Explanation:

Assuming your question is:

Z² - X² - XY X = -2, Y = 3, Z = -4

Substitute values

(-4)² - (-2)² - {(-2)(3)}

{(-4)(-4)} - {(-2)(-2)} - (-6)

(16) - (4) + 6

16 - 4 + 6

20