exam Maths Puzzle Numerical Ability

Solve the equation: log x + log (x + 48) = 2
I know the answer is 2 from the answers in the back of the book.
I need to know how the solution was solved.

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exam Other Question

The product of 3 and the sum of a number and 5 is the same as the product of -2 and the difference of the same number from 3. Find the number. please help me thank you

one number is 12 more than another.The sum of the smaller number and twice the larger number is 39.Find the larger.