Question

2. Determine o valor numérico de: a) 3. (x - 8), para x = 12 b) 3x + x3, para x = 4 c) x - x - 2x, para x = -2 d) 3x + - y, para x = 4 e y = 5 me ajudem pfvr​

Answer 1

$\displaystyle \mathsf{a)3.(x-8)}\\\\\displaystyle \mathsf{3(12-8)}\\\\\displaystyle \mathsf{3*4\to12}$

$\displaystyle \mathsf{b)3x+x^{3}}\\\\\displaystyle \mathsf{3(4)+4^{3}}\\\\\displaystyle \mathsf{12+64}\to76$

$\displaystyle \mathsf{c)x-x-2x}\\\\\displaystyle \mathsf{-2-(-2)-2(-2)}\\\\\displaystyle \mathsf{-2+2+4}\to4$

$\displaystyle \mathsf{d)3x+-y}\\\\\displaystyle \mathsf{3(4)+-5}\\\\\displaystyle \mathsf{12-5\to7}$