Question

what must be subtracted from 2x^2-3x+4 to get x^2+2x-1?

Answer 1

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Let the required expression be x.

A/q,

2x² - 3x + 4 - x = x² + 2x - 1

$\implies$2x² - x² - 3x - 2x + 4 + 1 = x

$\implies$x² - 4x + 5 = x

Hence, the required expression is x² - 4x + 5.