how to calculate the square of an expression having three components. like x(squar)+5x-6

is there any formola for taking square such as  (a+b)2=a2+b2+2ab

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1 Answer

multipli longhand

(x^2 +5x-6)^2=

x^4 +5x^3 -6x^2

+      5x^3 +25x^2 -30x

+                -6x^2 -30x +36

=x^4 +10x^3 +23x^2 -60x +36
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