exam Maths Puzzle Numerical Ability

Given f(x) = -x3 + 3x2 + x + 7, find f(-3), f(0), and f(1)

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exam Other Question

The qoutient of two numbers is 8 and their sum is 90. Find the number ? The sum of three numbers is 8. Twice the smallest is 2 less than the largest, and the sum of the largest and smalles is 5. Use linear system in three variables to find the three numbers.