exam Maths Puzzle Numerical Ability

Please help! I am getting several different solutions. I am lost.
Use the properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Evaluate.
log5 (x + 4) - log5 (x + 1)

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exam Other Question

Simplify by combining like terms.

square root of 98 + 3 square root of 50 - 3 square root of 8


8 square root of 5 - 11 square root of 5 + 3 square root of 5
Hi. My question is about factoring special cases.
The question is: x^2+20x+100

Can you help me solve this question? Thanks!