Bonsoir,
a)
AB = x+4
AD = x+2
b)
(x+4) ( x+2)
= x² +2x+4x+8
= x² +6x+8
c)
aire AEIH + aire EBFI + aire IFCG + aire HIGD
x² + 4x+ 8+ 2x
= x²+6x+8
d)
9* 7 = 63
25 + 20 + 8 + 10 = 63
