exam Maths Puzzle Numerical Ability

a2 – b2 = (a + b) (a – b)

a2 + b2 = (a + b) (?)

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exam Other Question

The surface area of a cube is the sum of the areas of the faces. Use exopents to write an expression for the surface area of the cube. (3sides-3cm) Given the functions f(x)=sqrt-3x+15 and g(x)=5/x, determine g * f(x) and find its domain.

*please note that the question has a small o where I have placed an * symbol. I am not sure what that means.

Please someone help me.