book Maths Puzzle Numerical Ability

NEED HELP SOLVING THIS QUADRATIC EQUATION

4x^2 + 8x =0

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book Other Question

What is the coefficient, the like term, and the constant of a+2a+3a-4a? I need help now. During a sale, the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is?