exam Maths Puzzle Numerical Ability

5) solve 4x+x(x-1)=0
find the x-intercepts of f(x)=4x+x(x-1)
What are the solutions x=��.
What are the x-intercepts

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44. A new automobile engine can run on a mixture of gasoline and a substitue fuel. If gas costs $1.50 per gallon and the substitue fuel costs 40 cents per gallon, what percent of a mixture must be substitue fuel to bring the cost down to $1 per gallon? Need answer to x^2 +2x +11 = (x+A)^2 + B where A and B are real numbers. What is A and what is B?