factorise=4a square + 9 b square + 25 c square + 12ab - 30 BC - 20 CA
Answers
Answered by
0
Answer:
4a
2
+9b
2
+c
2
−12ab−6bc+4ac
=(2a)
2
+(3b)
2
+(1c)
2
−2(2a)(3b)−2(3b)(1c)+2(2a)(1c)
=(2a+3b−c)
2
Answered by
2
Answer:
4a²+9b²+25c²+12ab-30bc-20ca
(2a)²+(3b)²+(-5c)²+2×2a×3b+2×3b×-5c+2×-5c×2a
(2a+3b-5c)²
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