Jawabanmu

2014-08-08T12:29:17+07:00
A. (x+2)^2 - (2x+3)^2 = Dijabarkan, kemudian sederhanakan
x^2 + 4x + 4 - (4x^2 + 12x + 9) =
x^2 + 4x + 4 - 4x^2 - 12x - 9 = -3x^2 - 8x -5
b. (a+8)^2 + (3a-4)^2 =
a^2 + 16a + 64 + 9a^2 - 24a + 16 = 10a^2 - 8a + 80

2014-08-08T12:30:36+07:00
A. = x" + 4 - 4x" + 9
= x" - 4x" + 4 + 9
= - 3x" + 13

b. = a" + 64 + 9a" + 16
= a" + 9a" + 64 + 16
= 10a" + 80

( x" = x kuadrad)
( a" = a kuadrad)