Question

ajuda ai pfv.........​

Answer 1

1-

a) $2^{2}$-5x2+8

4-10+8

-6+8

+2

b)$-2^{2}$-5x-2+8

-4+10+8

+6+8

14

c) $-4^{2}$+2x(-4)x0

$-4^{2}$+0

-16

d)$-2^{2}$+2x(-2)x3

-4-12

-16

2-

a)

$11x-13=20\\11x=20+13\\11x=33\\x=3$

b)

$17x+50=7x\\17x-7x=-50\\10x=-50\\x=-5$

c)

$9x-8=5x+20\\9x-5x=20+8\\4x=28\\x=7$

d)

$5x-6=2x+3\\5x-2x=3+6\\3x=9\\x=3$

e)

$12x+48=9x+60\\12x-9x=60-48\\3x=12\\x=4$

f)

$3(x+1)-2(x-1)=-x-5\\3x+3-2x+2=-x-5\\x+5=-x-5\\x+x=-5-5\\2x=-10\\x=-5$

Espero ter ajudado!!