Question

calcule
a) 2(x+y)
b) (a+5) (a-5)
c) (a+b)ao quadrado
AJUDE -ME

Answer 1

a) 2(x+y) = 2x+2y
b) (a+5).(a-5) = $a^{2}$-5a+5a-25 = $a^{2}$-25
c) $(a+b)^{2}$ = $a^{2}+2ab+b^{2}$

Answer 2

a) 2x+2y
b) a² -5a+5a+25 = a²+25
c)a²+ab+ab+b² = a²+2ab+b²