Jawabanmu

2014-09-10T16:31:12+07:00
A.(a+b)(a+b)= a^2 + ab + ab +b^2 = a^2 + 2ab +b^2
B.(a-b)(a-b) =a^2 -ab -ab + b^2 = a^2 -2ab + b^2

"^2" = kuadrat / pangkat dua
2014-09-10T16:33:02+07:00
1) (a + b) x ( a - b)
= a² - ab + ab - b²
=a² - b²

2a) (a+b)²
= (a + b) (a + b)
=a² + ab + ab + b²
=a² + 2ab + b²

2b) (a-b)²
= (a - b) (a - b)
= a² - ab - ab + b²
=a² - 2ab + b²