1.

(2x-y)²+5(2x-y)-300​

Answer»

(2x-y)^2=(4x^2)-(4xy)+(y^2)

5(2x-y)=10x-5y

[(2x-y)^2]+[5(2x-y)]-300

(4x^2)-(4xy)+(y^2)+10x-5y-300

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