Question

PLEASE SOLVE Q10 A
If a+b+c/7=8/4 and 2(a + b² +c) = 148 & ac = 35, then find (ab + bc)

Answer 1

Step-by-step explanation:

a+b+c= 8*7/4 = 14

2( a^2+ b^2 + c^2) = 148

a^2 +b^2 +c^2 = 74

( a+b+c)^2 = a^2+ b^2 +c^2 +2( ab+BC+ca)

(14)^2 = 74+2( ab+bc + 35)

196-74 = 2(ab+bc) +70

122 = 2(ab+bc) +70

122-70 = 2(ab+bc)

52/2 = ab+bc

26 = ab+bc

Answer 2

Answer:

a+b+c= 8*7/4 = 14

2( a^2+ b^2 + c^2) = 148

a^2 +b^2 +c^2 = 74

( a+b+c)^2 = a^2+ b^2 +c^2 +2( ab+BC+ca)

(14)^2 = 74+2( ab+bc + 35)

196-74 = 2(ab+bc) +70

122 = 2(ab+bc) +70

122-70 = 2(ab+bc)

52/2 = ab+bc

26 = ab+bc