Question

1) Efetue
a) (5xelevado a 2 4x+7)-(3x2 + 7x-1)=
$(5{x}^{2} - 4x + 7) - (3 {x}^{2} + 7x - 1)$
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Answer 1

(5x² - 4x + 7) - (3x² + 7x - 1)

5x² - 4x + 7 - 3x² - 7x + 1

5x² - 3x² - 4x - 7x + 7 + 1

2x² - 11x + 8