If a and b are rational numbers and 5+2√3/7+4√3 = a - b √3 ( NCERT example)
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5+2√3/7+28√3/7= a-b√3
5+30√3/7=a-b√3
5+(-30√3/7)=a-b√3
on comparing a-b√3 with LHS, we get
a=5 and b=-30/7
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