Question

efetue:
$(5 {x}^{2} - 4x + 7) - (3 {x}^{2} + 7 {x - 1}^{2}$
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Answer 1

$( {5x}^{2} - 4x + 7) - (3 {x}^{2} + 7x - {1}^{2} )$

$5 {x}^{2} - 4x + 7 - (3 {x}^{2} + 7x - 1)$

${5x}^{2} - 4x + 7 - {3x}^{2} - 7x + 1$

${2x}^{2} - 11x + 8$