(e) If a - b = -2 and a3 - b3 = -26, find ab.
Answers
Answered by
2
Answer:
a-b=2
a^3-b^3=-26
a^3-b^3=(a-b)(a^2-ab+b^2)
a^3-b^3=(-2)(a^2-ab+b^2)
-26/-2=a^2-ab+b^2
13=(a-b)^2
Answered by
6
3
Step-by-step explanation:
(a - b) ³ = a³ - b³ - 3ab(a-b)
(-2)³ = (-26) - 3ab (-2)
-8 + 26 = 6ab
18. = 6ab
18/6 = ab
3. = ab
Thus , ab = 3
Similar questions