Question

Preciso dos cauculos, me ajudem!

Answer 1

a) (20x - 7x + 10) + 4x(+7)
13x (+10) + 4x(+7)
17x (+10 +7)
17x + 17

b) 16x (+10x -15) + -x (-4)
+15x +10x -19
25x -19

c) 49x (-6x +20) - 9x (+3x +15)
40x (-6x+20+3x+15)
40x -3x +35
37x +35

Answer 2

a)

$(5x^2-7x+10)+(2x^2+10-3)\\5x^2+2x^2-7x+10+10-3\\\\\boxed{7x^2-7x+17}$

b)

$(4x^2+10x-15)+(-7x+6x-4)\\4x^2+10x-15-7x+6x-4\\4x^2+10x-7x+6x-15-4\\\\\boxed{4x^2+9x-19}$

c)

$(7x^2-6x+20)-(3x^2+3x+15)\\7x^2-6x+20-3x^2-3x-15\\7x^2-3x^2-6x-3x+20-15\\\\\boxed{4x^2-9x+5}$