Question

6. Simplify the following expressions and find the value for x =-1, y = 1 and 2 = 2
(iii) (x3 + y3 – z) (2x + y - z)
​

Answer 1

Answer:

(x3 + y3 - z ) × (2x + y - z )

((-1×3) + (1×3) - z ) × ((2× (-1)) + 1 - z )

(-3 + 3 - z ) × (-2 + 1 - z )

(0- z ) × ( -1 - z )

(-z-z) × (-1-0)

2z × 1

z = 1/2