Question

(vi) x2 + y2 from 2x2 - y2 +3 ​

Answer 1

$x2 + y2 - 2x2 - y2 +3 \: = \: 2 + 3 \: = \: 5$

I think

Answer 2

x² + y² from 2x² - y² + 3

= 2x² - y² + 3 - (x² + y²)
= 2x² - y² + 3 - x² - y²
= 2x² - x² - y² - y² + 3
= x² - 2y² + 3

Hope it helps you
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