WAEC - Mathematics (1995 - No. 13)
Factorize the expression x(a - c) + y(c - a)
(a - c)(y - x)
(a - c)(x - y)
(a + c)(x - y)
(a + c)(x + y)
(a - c)(x + y)
Vysvětlení
x(a - c) + y(c - a)
= x(a - c) - y(a - c)
= (x - y)(a - c)
x(a - c) + y(c - a)
= x(a - c) - y(a - c)
= (x - y)(a - c)