value of (a+b)^3+(a-b)^3
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Answer:
a-b=3…………..(1) and ab=4…. ……..(2)
Squaring both side eq.(1)
a2+b^2–2ab=9
a^2+b^2–2×4=9
a^2+b^2=17………….(3)
a^3-b^3=(a-b)(a^2+b^2+ab)
= (3) ×(17 +4)
=3×21
=63 , Answer.
Step-by-step explanation:
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