If ab = 6 and a + b = 5, then find the value of a +b square
(A) 11
(B)12
(C) 13
(D) 16
Answers
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Step-by-step explanation:
given,
ab=6,--------(1)
a+b=5.----------(2)
(a+b)^2=?
from(1),we get
ab=6
a=6/b-----------(3)
substituting (3) in equation (2),we get
[(6/b)+b]=5
6/b+b=5
6+b=5b
6=5b-b
6=4b. therefore a=6/b=6/0.6=10
b=4/6
b=0.6
(a+b)^2=a^2+b^2+2ab
=10^2+0.6^2+2×10×0.6
=100+0.36+12
=112.36
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