exam Maths Puzzle Numerical Ability

Factor completely:
7x^2 + 49x + 42

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exam Other Question

Help please: Determine algebraically whether the lines are parallel, perpendicular or neither. State the number of solution.

x - y = 5
x = 5 - y 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.