Question

Simply :
$(x {}^{2} + y {}^{2} + 1) + (x {}^{2} + y {}^{2} - 1) + (x {}^{2} - y {}^{2} + 1) + (y {}^{2} + 1 - x {}^{2} )$
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Answer 1

Answer:

» (x² + y² + 1) + (x² + y² - 1) + (x² - y² + 1) + (y² + 1 - x²)

= 2(x² + y² + 2)

Answer 2

Answer:

an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.