Question

If x=-1 and y=0, then the value of x²+8y³ is
a) 2
b) 1
c) -1
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Answer 1

Answer:

1 is the answer

Step-by-step explanation:

x²+8y³

(-1)²+8(0)³

1

Answer 2

Answer:

x = 2y+6

⇒ x - 2y = 6      ...... (i)

cubing both sides

⇒ x³ - 8y³ - 6xy(x - 2y) = 216

⇒ x³ - 8y³ - 6xy(6) = 216      {since , x - 2y = 6 from i}

⇒x³ - 8y³ - 36xy - 216 = 0

so the value of x³ - 8y³ - 36xy - 216 = 0  ANSWER

Step-by-step explanation: