Question

what should be added to xsquare + 4 to get 2xsquare + 5​

Answer 1

Answer:

x² + 3

Step-by-step explanation:

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Answer 2

Answer:

x²+4+a=2x²+5

a=2x²+5-(x²+4)

a=

$let \: the \: unknown \: n o \: be \: a \\ x {}^{2} + 4 + a = 2x {}^{2} + 5 \\ a = 2x {}^{2} + 5 - (x {}^{2} + 4) \\ a = 2x {}^{2} + 5 - x {}^{2} - 4 \\ a = x { }^{2} + 1$