Question

50 PONTOS URGENTEEE!!
Desenvolva os produtos :

Answer 1

Explicação passo-a-passo:

a)

$\sf (1-4a^3)\cdot(1+4a^3)=1^2-(4a^3)^2$

$\sf (1-4a^3)\cdot(1+4a^3)=\red{1-16a^6}$

b)

$\sf \left(7x+\dfrac{y}{x}\right)\cdot\left(7x-\dfrac{y}{x}\right)=(7x)^2-\left(\dfrac{y}{x}\right)^2$

$\sf \left(7x+\dfrac{y}{x}\right)\cdot\left(7x-\dfrac{y}{x}\right)=\red{49x^2-\dfrac{y^2}{x^2}}$

c)

$\sf (x^5-4)\cdot(x^5+4)=(x^5)^2-4^2$

$\sf (x^5-4)\cdot(x^5+4)=\red{x^{10}-16}$

d)

$\sf (y+9)\cdot(y+3)$

$\sf =y^2+3y+9y+27$

$\sf =\red{y^2+12y+27}$

e)

$\sf \left(\dfrac{x}{y}-8\right)\cdot\left(\dfrac{x}{y}-6\right)$

$\sf =\dfrac{x^2}{y^2}-\dfrac{6x}{y}-\dfrac{8x}{y}+48$

$\sf =\red{\dfrac{x^2}{y^2}-\dfrac{14x}{y}+48}$

f)

$\sf (a-4)\cdot(a+6)$

$\sf =a^2+6a-4a-24$

$\sf =\red{a^2+2a-24}$

Answer 2

Resposta:

leshumerehe

Explicação passo-a-passo: