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FPB dari 9 dan 12 = 3
FPB dari a²b³ dgn a⁶ b² = a²b²
9a²b³ - 12a⁶b²= 3 a²b² ( 3b - 4a⁴)
faktor nya 3a²b² dan (3b-4a⁴)
5) (3x + 2y)² - 3(2x-5y)² =
= (3x)² + 2(3x)(2y) + (2y)² - 3 [(2x)² - 2(2x)(5y) + (5y)²]
= 9x² + 12 xy + 4y² - 3( 4x²-20xy + 25y²)
= 9x² +12xy + 4y² -12x² +60xy -75y²
= (9-12)x² + (12+60) xy + (4-75)y²
= -3x² + 72 xy -71 y²
6) (2a + 3b - 4c)² = (2a)²+(3b)²+(-4c)² + 2(2a)(3b) + 2(2a)(-4c)+2(3b)(-4c)
= 4a²+9b²+16c² + 12ab - 16ac - 24 bc
7) faktor dari 4p² -20 pq + 25q² =
= 4p² -10 pq - 10 pq + 25q²
= (4p²-10pq) + (-10pq + 25q²)
= 2p(2p-5q) - 5q(2p - 5q)
= (2p-5q)(2p-5q)
= (2p - 5q)²
8) (a- a²)/(a²-6a+5) =
= -a(a - 1) / (a-1)(a-5)
= - a/(a-5)
9)
= [9(x-2)(x+2)(3)(x+5)]/[(x+5)(3x²-x-6)]
= [27(x²-4)]/[3x² -x - 6]