Question

How to find value of a and b if a+b=10 ? ab=21

Answer 1

a+b=10
a=10-b ---eq.1
put the value of 'a' in ab=21
(10-b)b =21
$10b - b {}^{2} = 21$
on solving , b= 52
put this value in eq.1,
a= -42