Question

If a-2b= 5 and ab = 18, find a³-8b³

Answer 1

Answer:

100

Step-by-step explanation:

Given: a+2b=10 and ab=15

By using identity (a+b)2=a2+b2+2ab

a2+4b2+4ab=100

a2+4b2=100-4ab

Answer: (a)3+(2b)3

by using identity a3+b3= (a+b)(a2+b2-ab)

(a+2b)(a2+4b2-2ab)

(10)(100-4ab-2(15))

(10)(100-4(15)-30)

(10)(100-60-30)

(10)(10)

100

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Answer 2

Answer:

565

Step-by-step explanation:

hope it will help thank you