Question

7. Evaluate each of the following algebraic expressions for
x = 2, y = - 3, z = -2, a = 2, b = 3:
(i) 2a² + ab (ii) 2a² + x² - y²(iii) 4xy²– 3yz² + 4x²z
(iv) x³ + y⁴ + 3xyz + ab​

Answer 1

1. 2(2)²+2×3

2×4+2×3

8+6

14

2. 2(2)²+(2)²-(-3)²

2×4+4-9

8+4-9

12-9

3

3. 4(2)(-3)²-3(-3)(-2)²+4(2)²(-2)

8×9+9×4-8×4

72+36-32

108-32

76

4. (2)³+(-3)⁴+3×2×(-3)×(-2)+2×3

8+81+36+6

89+42

131