exam Maths Puzzle Numerical Ability

how do I rewrite the logarithm below as a single logarithm with a coefficient of 1?
2log_b x+5log_b y

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exam Other Question

what is the answer step by step to the following quadratic equations ?


x squared-4x-15=0
x squared+8x-33=0
x squared+5x+2=0
3xsquared-3x+6=0
Help would be great i need it bad
help in simplifying complex fractions is needed please:
2/a + 1/2a / a + a/2