exam Maths Puzzle Numerical Ability

logb(x) + logx(b) = 7
Find ((logb(x))^2 + ((logx(b))^2

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exam Other Question

explain why y= 1*1 is not linear I'm not sure how to solve these problems:
-7(√18)-5(√200)-3(√162)

7x^3/7
My Work:
(^7√7x)^3= x^3?

(√p^2-5p+9)= p-2
My Work:
(√p^2-5p