Question

please help only correct answers Question no. 16​

Answer 1

let the number to be subtracted = X

(-7mn + 2m² + 3n²) - X = (m² + 2mn + n²)

(-7mn + 2m² + 3n²) - (m² + 2mn + n²) = X

X = -7mn + 2m² + 3n² - m² - 2mn - n²

X = -7mn - 2mn + 2m² - m² + 3n² - n²

X = - 9mn + m² + 2n²