PLEASE SOLVE Q10 A
If a+b+c/7=8/4 and 2(a + b² +c) = 148 & ac = 35, then find (ab + bc)
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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
Answered by
1
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
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