What is the value of 64x3 + 36x2y+ 24xy2+2y3, when x = 3 and y = -4?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 1456.
Given that
64x3 + 36x2y + 24xy2 + 2y3 ; when x = 3 and y = -4
Substituting the values we get
64(33) + 36(32)(-4) + 24(3)(-42) + 2(-43)
⇒ 64(27) + 36(9)(-4) + 24(3)(16) + 2(-64)
⇒ 1728 - 1296 + 1152 - 128
⇒ 1456