if x=-1/2 and p(x)= 8x^3 -ax^2-x+ 2 find the value of a
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8x^3 - ax^2 - x + 2 =
8 (-1/2)^3 - a(-1/2)^2 -(-1/2) + 2 =
8(-1/8) - a(1/4) + 1/2 + 2 =
-1 - 1/4 a + 5/2 =
-1/4a +5/2 - 1 =
-1/4 a + 3/2 =
-1/4 a = -3/2
a = -3/2 × -4/1
a = 12/2
a = 6
8 (-1/2)^3 - a(-1/2)^2 -(-1/2) + 2 =
8(-1/8) - a(1/4) + 1/2 + 2 =
-1 - 1/4 a + 5/2 =
-1/4a +5/2 - 1 =
-1/4 a + 3/2 =
-1/4 a = -3/2
a = -3/2 × -4/1
a = 12/2
a = 6
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