Cutting speed, when applied to a grinding wheel, is called surface speed. What is the surface speed in ft/min of a 10-in-diameter grinding wheel revolving at 1,400 rpm? (Surface speed equals =circumference in feet times ×rpm.)

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Ответ:

aprilkenedy12

09.01.2021

Mathematics

-a^2+ab

Step-by-step explanation:

So the sentence can be written like this:

((a^2-b^2)+(a^2+ab+3b^2))-((a^2-2ab+b^2)+(2a^2+2ab+b^2))

Now you can combine like terms in the first part of the equation and the second part:

((a^2+a^2)+ab+(-b^2+3b^2))-((a^2+2a^2)+(-2ab+2ab)+(b^2+b^2))

Which leaves you with:

(2a^2+ab+2b^2)-(3a^2+2b^2)

Now distribute the negative to the second part of the equation:

2a^2 + ab + 2b^2-3a^2-2b^2

Combine like terms again:

(2a^2-3a^2)+ab+(2b^2-2b^2)

Which becomes:

-a^2+ab

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