Simplify the following expressions and find the value for x = -1 , y = 1 and z = 2 ( help me plz plz it's my exam ) fast plz plz plz help me a) ( 2x+y) + 3y ( y-z) -2x ( x-y )
b) ( x-2y) ( 3x² + 4xy - y²)
c) ( x³ + y³ - z³) ( 2x + y -z)

Step-by-step explanation:

a) ( 2x+y) + 3y ( y-z) -2x ( x-y )

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

↪ -1 + 3 × -1 × - 2 × -1 × -2

↪ -1 + 12 = 11 , answer

b) ( x-2y) ( 3x² + 4xy - y²)

↪ (-1 - 2 × 1) (3 × -1² + 4 × -1 × 1 - 1²)

↪ -3 × (- 3 - 1 - 4 - 1)

↪ -3 × -9

↪ 27, answer

c) ( x³ + y³ - z³) ( 2x + y -z)

↪ (-1³ + 1³ - 2³) (2 × -1 + 1 × -2³)

↪ (-1 + 1 - 8) (-2 - 8)

↪ -8 × -10 = 80, answer

what?

step-by-step explanation:

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step-by-step explanation: