Question

me ajudem por favor!!

Answer 1

a) 3a + 2b - c = $-3x^{2} - 7x + 3$ trinômio

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

$6x^{2} -6x+3$ +($-10x^{2} + 6x - 4$ )- $x^{2} + 5x - 4$

$6x^{2} +(-10x^{2}) + x^{2} - 6x + 6x + 5x + 3 + 4 - 4$

= $-3x^{2} - 7x + 3$

b) c - 2a -3b = $22x^{2} + 10x$ binômio

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

$x^{2} + 5x - 4$ - $6x^{2} - 4x + 2 - (-15x^{2}) + 9x - 6$

$x^{2} + 6x^{2} - (-15x^{2} ) + 5x - 4x + 9x - 4 + 2 -6$

$22x^{2} + 10x$