- 67
substitute the given values for x and y into the expression and evaluate
= - 6(2)³ - (4)² - 3 = ( - 6 × 8 ) - 16 - 3 = - 48 - 16 - 3 = - 67
[tex]x=2, y=4\\-6x^3-y^2-3 = -6\cdot 2^3-4^2-3 = -6\cdot8-16-3=21[/tex]
