Question

Subtract x²-y²+z²+2yz from x²+y²+z²+2yz​

Answer 1

Answer:

2y²

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Step-by-step explanation:

we will apply the KFC rule to the minuend, sign and subtrahend.

KFC states:

Keep the minuend as it is

Flip the sign (subtraction to addition)

Change the sign of the subtrahend.

so, we keep the minuend the same: x²+y²+z²+2yz ;

flip the sign: + ;

and change the sign of the subtrahend: -x²+y² -z²-2yz.

now, we add the two terms since the sign has changed.

(x²+y²+z²+2yz)+(-x²+y² -z²-2yz)

= 2y²