Question

X² - 2xy, para x = 5 e y = 3 =

2 x + 8 x - x =


3 x - 7 x - x =


5 y . y =


2 x . x . 3 y =

3 x . 4 x² =

( 10 x² + 3 x - 8 ) + ( 5 x² + 5 x - 5 ) =


( 8 x² - 3 x + 9 ) + ( 2 x² + 3 x - 9 ) =

Answer 1

a) x²- 2xy para x=5 y=3
x²-2.5.3
x²-30=0
x²=0+30
x²=30
x=√30