exam Maths Puzzle Numerical Ability

A rectangle has sides of 5x-12 and 5x+12. What is the area of the rectangle? In side the rectangle two squares with sides of x and x are to be removed. What is the remaining area of the rectangle?

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exam Other Question
which is the range of f(x) = -(x over 3) to the power of 2?

a. f(x) greater than and equal to 0
b. f(x) greater than and equal to 3
c. f(x) less than and equal to 3
d. f(x) less than and equal to 0 my instructor told me to substitute and then use logarithm
but im not quite sure how

10^2x-2(10^x)=0
to substitute like she said i used 10^x as y
so
y^2-2(y)=0
y^2-2y=