Question

a+b-c=5 and a^2+b^2+c^2=29 find the value of ab -bc-ca

Answer 1

Hey brain-ly user is answer is here.....

Given:-

a+b-c=5........(i)

squaring of eq......(i)

(a+b-c)^2=a^2+b^2+c^2+2(ab-bc-ca)

(5)^2=29+2(ab-bc-ca)

25=29+2(ab-bc-ca)

-4=2(ab-bc-ca)

[[[[[[ab-bc-ca=-2]]]]]]

Please mark me as brainliest.....