pls help me do this...........
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25. (5+2rt3)×(7-4rt3)/ {(7+4rt3)×(7-4rt3)} =(5+2rt3)×(7-4rt3)/(49-48)= (5+2rt3)(7-4rt3)= 5×7-5×4rt+2rt3×7-2rt3×4rt3 =35-20rt3+14rt3-24=11-6rt3=a+brt3 So a=11 and b= -6
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