A dairy farmer wants to mix a 85% protein supplement and a standard 35% protein ration to make 1400 pounds of a high-grade 45% protein ration. How many pounds of each should he use?

f(x)=(3.x4+1)2

Use the distributive property to multiply 3x  4   +1 by 2.

fx=6x  4  +2

The equation is in standard form.

xf=6x  4  +2

Divide both sides by x.

x  xf  =  x 6x  4  +2

Dividing by x undoes the multiplication by x.

 f=  x 6x  4 +2

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Divide 6x  4 ​+2 by x.

 f=  x 2(3x  4 +1)

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This will help you if you are trying to solve for F. Hope this helped and hope this is correct.