Asked by kayleigh

given that a and b are rational numbers, find the value of a and of b in the following equation:
a-bsquareroot7 = (2+squareroot7)(2-squareroot7)+squareroot7
Answered by collins
a-broot(7)=(2)^2-root(7)^2+roo(7)
a-broot(7)=4-7+root(7)
a-broot(7)=root(7)-3
now just compare the coefficent
a=?
b=?
Answered by Steve
(2+√7)(2-√7)+√7
4-7+√7
-3+√7

a = -3
b = -1
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