exam Maths Puzzle Numerical Ability

2 x 5^0 � 3^0

would it be 10^0 - 6^0

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exam Other Question

Solve the equation: log x + log (x + 48) = 2

I know the answer is 2 from the answers page.

I need to know how the solution was solved.

Thank you. 2(4-2r)=-2(r+5)