book Maths Puzzle Numerical Ability

16x^2-8x+1

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book Other Question

Please help me to do this equation 15-4x=42-7x A number is a decreasing number if it has two or more digits and each digit is less than the digit to its left. For example 754 and 620 are decreasing numbers, but 756 and 6220 are not decreasing numbers. How many decreasing numbers are there?