Question

socorro preciso disso urgente

1) Determine o valor de x nos casos:

Answer 1

a)

h²=m*n

x²=9*4

x=6

b)  

h²=m*n

6²=12*x

36=12*x

x=3

2ª folha

a) x²=4*9  ==>x=6

b) x*(x+6)=4²

x²+6x-16=0

x'=[-6+√(36+64)]/2=(-6+10)/2=2

x''=[-6-√(36+64)]/2=(-6-10)/2=-8 < 0 ñ serve

x=2

c)

h²=4*5

h²=20

x²=h²+4²

x²=20+16

x=6

d)

h²=9*16

x²=h²+16²

x²=9*16+16²

x²=400

x=20

e)

6²=12*x

x=3

f)

h²=4*12=48

x²=h²+12²

x²=48+144=192

x=√192=4√12

g)

h²=x*9

6²=h²+x²

6²=9x+x²

x²+9x-36=0

x'=[-9+√(81+144)]/2=(-9+15)/2 =3

x''=[-9-√(81+144)]/2 < 0  ñ serve

h)

x/6=6/18

x=36/18

x=2