[tex](x + a){}^{2} \\ mohon \: jawaban \: dan \: penjelasannya \\ soalnya \: mau \: diperiksa \: besok[/tex]

(x + a)²
= (x + a) × (x + a)
= x(x + a) + a(x + a)
= x² + ax + ax + a²
= x² + 2ax + a²

( x + a ) ^2

----> ( x + a ) + ( x + a )
----> (( x × x ) + ( a × x )) + (( a × x ) + ( a × a ))
----> x^2 + ax + ax + a^2
----> x^2 + 2ax + a^2