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Help please! I can't figure this one out.

Help please! I can't figure this one out.-example-1
User Shaish
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g(x+a)-g(x)=4(x+a)^2-2(x+a)-(4x^2-2x)\\ g(x+a)-g(x)=4(x^2+2ax+a^2)-2x-2a-4x^2+2x\\ g(x+a)-g(x)=4x^2+8ax+4a^2-2a-4x^2\\ g(x+a)-g(x)=8ax+4a^2-2a
User Murat Sutunc
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