(8x^4 + 4x^2 + x) - (x + 10)(2ax^2 + 1) The expression is simplified to 8x^4 - 6x^3 - 56x^2 - 10.
What is the value of "a" ?
If
(8x^4 + 4x^2 + x) - (x + 10)(2ax^2 + 1) is simplified to 8x^4 - 6x^3 - 56x^2 - 10,
then the expression must be true for all values of x
how about letting x = 1
(8 + 4 + 1) - (11)(2a + 1) = 8 - 6 - 56 - 10
13 - 22a - 11 = -64
-22a = -66
a = 3