Question

what must be added to sum of x2 -4x+7 and 2x2+5x-9is to get zero
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Answer 1

Answer:

x2 - 4x + 7 + 2x2 + 5x - 9

ATQ (According to the question),

-23 + x = -9

x = -9 + 23

x = 14

Therefore the number to be added is 14.