if a minus b equals to 7 and a square + b square equals to 85 then find the value of a cube minus b cube
Answers
Answered by
0
Answer:
721
Step-by-step explanation:
a - b = 7
a^2 + b^2 = 85
on squaring (1) both sides, we have
a^2 + b^2 - 2ab = 49
-2ab = 49-85 = -36
ab = 18 Therefore,
a^3 - b^3 = (a-b) ( a^2 + b^2 + ab)
= 7 (85 + 18 ) = 721
Answered by
0
Answer:
ur answrr is in picture hope it helps u........
______________@divu
Attachments:
Similar questions