4. Find the value of a if (2x-5)(x+3)=2x²+x+a.
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Step-by-step explanation:
(2x-5)(x+3)=2x^2+x+a
2x(x+3)-5(x+3)=2x^2+x+a
2x^2+6x-5x-15=2x^2+x+a
6x-5x-x-15=2x^2-2x^2+a
6x-6x-15=a
-15=a
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