Question

Tentukan hasil dari:
A.(a-b)²
B.(ax+b)x(cx+d)

*berdasarkan caranya yaa...biar saya faham :-D

Answer 1

A. (a-b)^2=(a-b)(a-b)
              =a^2 -ab -ab +b^2
              =a^2 -2ab +b^2

Answer 2

A. (a-b)^2  = (a-b)(a-b)
= (a.a + a.-b + (-b.a) + (-b.-b )
= (a^2 – ab – ab + b^2 )
= (a^2 – 2ab + b^2)                          

B.(ax + b)(cx + d )
= (ax.cx + ax.d + b.cx + b.d )
= (acx^2 + adx + bcx + bd)  

Contoh :                           (5x + 2)(2x + 3)
= (5x.2x + 5x.3 +  2.2x + 2.3 )
= ( 10x^2 + 15x + 4x + 6 )
= (10x^2 + 19x + 6 )