find the value of a and b such that 2+5 root 7 divided by 2-5root7=a+root7b

plz plz answer this.
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1 Answer

(2+5√7)/(2-5√7)=(2+5√7)(2+5√7)/[(2+5√7)(2-5√7)]=

(4+20√7+175)/(4-175)=(179+20√7)/(-171).

So a=-179/171, b=-20/171, -(179+20√7)/171 is the rationalised expression.
by Top Rated User (1.1m points)

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