exam Maths Puzzle Numerical Ability

Can you help me find a example of when log(A+B) = log(A) + log(B) would be true?

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exam Other Question

decide all values of b in the following equations that will
give one or more real number solutions.
(a) 3x^2 + bx - 3 = 0
(b) 5x^2 + bx + 1 = 0
(c) -3x^2 + bx - 3 = 0 How do I graph the following using the intercept method? 2x=3y=6, 2x-3y=12