Question

(3p-2q-4r)^3 sama dgn brp?

Answer 1

(3p-2q-4r)³ = (3p-2q-4r)² (3p-2q-4r)

(3p-2q-4r)² = (3p-2q-4r) (3p-2q-4r)
= (3p x 3p) + (3p x -2q) + (3p x -4r) + (-2q x 3p) + (-2q x -2q) + (-2q x -4r) + (-4r x 3p) + (-4r x -2q) + (-4r x -4r)
= (3p x 3p) + 2(3p x -2q) + 2(3p x -4r) + (-2q x -2q) + 2(-2q x -4r)  + (-4r x -4r)
= 9p² -14pq -24pr +4q² +16qr +16r²

(3p-2q-4r)³ = (3p-2q-4r)² (3p-2q-4r)
=27p³ - 54p²q-108p² r+36pq²+144pqr+144pr² - 8q³- 48q²r - 96qr²- 64r³