Question

If asq + bsq + csq =90,a+b+c=20 find the value of ab+bc+ca

Answer 1

https://m.meritnation.com/ask-answer/question/if-asq-bsq-csq-20-a-b-c-6-find-ab-bc-ca/algebraic-expressions-and-identities/8523567


due to shortage of time I can't solve it...hope this link helps u