ab = 78 and a + b = 19 then a =
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Answer:
6 or 13
Step-by-step explanation:
a+b=19 ......... (1)
ab=78
b=78/a
substituting value of 'b' in equation (1),
a+78/a=19
a^2+78=19a
a^2-19a+78=0
a^2-6a-13a+78=0
a(a-6)-13(a-6)=0
(a-6)(a-13)=0
a= 6 or 13
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