find 27a^3 + 64b^3 if 3a+4b=10 and ab=2
Answers
Answered by
1
Step-by-step explanation:
sry appolozie i dont know answer
Answered by
2
Answer:
Step-by-step explanation:
3a + 4b = 10, ab = 2 (3a + 4b)3 = (3a)3 + 3(3a)2 (4b) + 3 (3a) (4b)2 + (4b)3 (27a3 + 64b3) = (3a + 4b)3 – 3 (3a) (4b) (3a + 4b) ∵ x3 + y3 = (x + y)3 – 3xy – (x + y) = 103 – 36 ab (10)= 1000 – 36 x 2 x 10 = 1000 – 720 = 280
Similar questions