Question

a-b=7 and a^2+b^2=85
find a^3-b^3
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Answer 1

Step-by-step explanation:

a = 7+b -----------------(1)

a2 + (7+b)2 = 85

a2 + b2 = 85 - 49

√a2+b2 = √36

a+b = 6

a = 6 - b ------------------(2)

from (1) and (2)

a = 11 ------------------(3)

put a = 11 in (1)

then;

b = 4 ---------(4).

from (3) and (4) ,we find a3 - b3

11^ 3 - 4^3

1331 - 64

= 1267

I hope this this is right answer . And this will help u.....