Question

f) a –b ( para a =3 e b = -1/2)




g) a³ - 5 a (para a = -2)




h) x² - 2y ( para x = -3 e y =5)





i) 3a² - b² (para a = -2 e b = -7)




j) 5a² + 3ab (para a = -3 e b = 4)





k) a² + 4a (para a = 2/3)


alguem em ajuda

Answer 1

Resposta:

Hi, there!

Explicação passo-a-passo:

f)

$a-b = \\3 - ( - \frac{1}{2} )\\3 + \frac{1}{2} \\3 + 0,5 = 3,5$

g)

$a^{3} - 5a\\(-2)^{3} - 5*(-2)\\\\-8 + 10 = 2$

h)

$x^{2} - 2y\\(-3)^{2} - 2*5\\6 - 10 = -4$

i)

$3a^{2} - b^{2} \\3(-2) - (-7)^{2} \\-6 - 49 = - 55$

j)

$5a^{2} + 3ab\\5(-3)^{2} + 3(-3)(4)\\5*9 - 36\\45 - 36 = 9$

k)

$a^{2} + 4a\\(\frac{2}{3} )^{2} + 4(\frac{2}{3} )\\\\\frac{4}{9} + \frac{8}{12}$

simplificando

$\frac{4}{9} + \frac{4}{6} >>> simplificando 2 >>>> \frac{4}{9} + \frac{2}{3} \\\\mmc\\\\\frac{4+2}{9} >> \frac{6}{9} = \frac{2}{3}$