Question

multiplique e simplifique as expreçoes
(a − 2).(a − 7) =
( y + 6).( y − 6) =
(2 x − 5).(3x − 2) =

Answer 1

(a − 2).(a − 7) =  a² - 7a - 2a + 14 = a²-10a+14

( y + 6).( y − 6) =  y² - 6y + 6y - 36 = y² - 36

(2 x − 5).(3x − 2) = 6x² - 4x - 15x + 10 = 6x²-19x+10

Answer 2

Explicação passo-a-passo:

(a − 2).(a − 7) =

= a.a -7.a-2.a+(-2).(-7)

=a²-7a-2a+14

= a²-9a+14

( y + 6).( y − 6) =

= y.y-6.y+6.y+6.(-6)

= y²-6y+6y-36

= y²+0-36

= y²-36

(2 x − 5).(3x − 2) =

2x.3x+2x.(-2)-5.(3x)+(-5).(-2)

6x²-4x-15x+10

6x²-19x+10