f(5)=2x^2-5

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Solution for f(5)=2x^2-5 equation: 


Simplifying
f(5) = 2x2 + -5

Reorder the terms for easier multiplication:
5f = 2x2 + -5

Reorder the terms:
5f = -5 + 2x2

Solving
5f = -5 + 2x2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by '5'.
f = -1 + 0.4x2

Simplifying
f = -1 + 0.4x2

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