If $$a + b +c= 6$$, $$a^{2}+ b^{2}+ c^{2} = 14$$, find the value of $$bc + ca + ab$$.
It is given that : $$a + b + c = 6$$ and $$a^{2}+ b^{2}+ c^{2} = 14$$
Also, $$(a + b + c)^2 = a^2 + b^2 + c^2 + 2(ab + bc + ca)$$
=> $$6^2 = 14 + 2(ab + bc + ca)$$
=> $$ab + bc + ca = 22/2 = 11$$
Create a FREE account and get:
Day-wise Structured & Planned Preparation Guide
By proceeding you agree to create your account
Free CAT Schedule PDF will be sent to your email address soon !!!
