What is the value of x?
x + 2/15 = x + 1/5.
A)x = 1/2
B)x = 10
C)x = -1/2
D)x = -10
If s(x) = 2x^2 + 3x - 4, and t(x) = x + 4 then s(x) · t(x) =
A)2x^3 + 11x^2 + 8x - 16
B)2x^3 + 5x^2 + 16x - 16
C)3x^3 + 7x^2 + 8x + 16
D)3x^3 - 11x^2 + 16x + 16
+128474 (x + 2) / 15 = (x + 1 ) / 5 cross-multiply
5 ( x + 2) = 15 (x + 1) simplify
5x + 10 = 15x + 15 subtract 15, 5x from both sides
-5 = 10x divide both sides by 10
-5 / 10 = x = -1/2
If s(x) = 2x^2 + 3x - 4, and t(x) = x + 4
s(x) * t (x ) = [ 2x^2 + 3x - 4 ] [ x + 4 ] = [ 2x^3 + 3x^2 - 4x + 8x^2 + 12x - 16 ] =
[ 2x^3 + 11x^2 + 8x - 16 ]
