Question

Determine o valor de x

Answer 1

a) PA . PB = PC . PD

5 . 9 = 4 . x
45 = 4x
x = 45/4
x = 11,25

b) 2 . 9=x . 2x
18=2$x^{2}$
$x^{2}$=18/2
$x^{2}$=9
x$\sqrt{9}$
x=3

c) x . 9 = 8 . 11
9x = 88
x = 9,77...

d) x . x = 1 . x+12
$x^{2}$ = 1.x + 12
$\frac{ x^{2}}{x}$ = 12
x= 12