Exam Maths Puzzle Algebra

Solve
f(x)= 1/2x^2 + 6x^2 - 9?

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Exam Other Question

Find the distance between the points (3,17) and (-2,5) Q1. The sum of two numbers is 18 and the sum of their squares is 164. Find the numbers.

Q2. Find two numbers that total 12 and whose squares total 90.