Question

Me ajudem, por favor!?

c) (5x² + 2x - 4) - (6x² - x + 7)

d) (9a - 8b - c) + ( -2a + 6b + 7c)

Answer 1

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bons estudos

Answer 2

$c)(5 {x}^{2} + 2x - 4) - (6 {x}^{2} - x + 7) = \\ 5 {x}^{2} + 2x - 4 - 6 {x}^{2} + x - 7 \\ - {x}^{2} + 3x - 11$

$d)(9a - 8b - c) + ( - 2a + 6b + 7c) = \\ 9a - 8b - c - 2a + 6b + 7c \\ 7a - 2b + 6c$