Question

(x-y)^2 - (x+2y)^2
sederhanakan!

Answer 1

Ingat :
a² - b² = (a - b)(a + b)
maka :
(x - y)² - (x + 2y)²
= {(x - y )- (x+ 2y)} {(x - y) + (x + 2y) }
= {x - y - x - 2y}{x - y + x + 2y}
= (-3y)(2x + y)
= - 6xy - 3y²