P(-1)=15x^2+(-1-1)+3

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Solution for P(-1)=15x^2+(-1-1)+3 equation: 


Simplifying
P(-1) = 15x2 + (-1 + -1) + 3

Reorder the terms for easier multiplication:
-1P = 15x2 + (-1 + -1) + 3

Combine like terms: -1 + -1 = -2
-1P = 15x2 + (-2) + 3
-1P = 15x2 + -2 + 3

Reorder the terms:
-1P = -2 + 3 + 15x2

Combine like terms: -2 + 3 = 1
-1P = 1 + 15x2

Solving
-1P = 1 + 15x2

Solving for variable 'P'.

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

Divide each side by '-1'.
P = -1 + -15x2

Simplifying
P = -1 + -15x2

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