(x+a)(x+b) = _________________ .
+ (a+b) x + ab
+ (a + bx) x +ab
+ (ax + b) x +ab
+ (a + b) +ab
(x+a)(x+b) = x2+(a+b)x+ab
x2+x(a+b)+ab is equal to
x2 + (a + b)x + ab can be factorised as ______ .