You have to use brackets
Surely you meant:
(2+5√7)/(2-5√7) = a + √7 b
on the left side, multiply by (2+5√7)/(2+5√7)
then match up the coefficients of the rational terms and match the coefficients of the irrational terms
let me know what you got
2. I don't know what "5 pwer 2 square 9" means.
3.
(a^2 - b^2) - 1/2
= (81 - 17) - 1/3
= .... continue
1)find rational number a and b such that 2+5root7/2-5root7=a+root7 b
2)find the value of x if 5 pwer 2 square 9=(125)x
3)if a=9 b=root17 then find the value of (a power2- b power2)-1/3
2 answers
5^(2√9) = 125^x
5^(2*3) = 125^x
(5^3)^2 = 125^x
125^2 = 125^x
2 = x
5^(2*3) = 125^x
(5^3)^2 = 125^x
125^2 = 125^x
2 = x