if a + b + c is equals to 5 and a b + BC + c is equals to 10 then prove that a cube plus b cube plus c cube minus 3 ABC is equals to minus 25
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Just put the formula of A3+b3+c3-3abc
Before that put the formula of a+b+c the whole square to get the value of a2+b2+c2 then put the values
Before that put the formula of a+b+c the whole square to get the value of a2+b2+c2 then put the values
shahruchitachip23651:
(A+b+c)(a2+b2+c2-ab-bc-ca)
(a+b+c)2=a2+b2+c2(
+2ab+2bc+2ca
25=a2+b2+c2+2(10)
=5
10(5-10)
ohhh sorry 5(5-10)
=-25
hence proved
it is not a proper answer for me i can solve this much by myself i am not able to solve it
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