Ifa-b=7 , ab=18 then a^3 - b^3= ?
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Answer:
Step-by-step explanation:
a-b=7
ab=18
(a+b)²=49+72=121
(a+b)²=a²+b²+2ab⇒121²=a²+b²+36⇒a²+b²=14641-36=14605
a³-b³=(a-b)(a²+ab+b²)=7(14605+18)=102361
Answered by
1
Answer:
This is the answer.
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