Answer:
7. 24
8. -1
9. 28
10. 24
Step-by-step explanation:
substitute values into equations. don't forget the brackets :))
7. 3x + 2y2 Let x = 4, y = 3
= 3(4) + 2(3)2
= 12 + 12
= 24
8. (x + 2)2 - (3x - 2) - 4 Let x = 3
= ((3) + 2)2 - (3(3) - 2) - 4
= (5)2 - (9 - 2) - 4
= 10 - 9 + 2 - 4
= -1
9. x + 2y - 3z + xyz Let x = 4, y = 3, z = 2
= (4) + 2(3) - 3(2) + (4)(3)(2)
= 4 + 6 - 6 + 24
= 28
10. xyz Let x = 4, y = 2, z = 3
= (4)(2)(3)
= 24
