Question

(e) If a+b+c=12 and a² + b2 + 2 = 64, find the value of ab + bc + ac.
125​

Answer 1

Please find the attachment

Answer 2

Answer:

(a+b+c)^2 = a^2 + b^2 + c^3 + 2(ab+bc+ca)

(12)^2 = 64 +2(ab+bc+ca)

144-64 = 2(ab+bc+ca)

80 = 2(ab+bc+ca)

80÷2 = ab + bc + ca

ab+bc+ca = 40

hope it help you!