Question

me ajude a faser e trabalho de recupesaçao

Answer 1

1)  x = 4 e y = 7

= 4x - y
= 4.4 - 7
= 16 - 7
= 9
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2) x = - 1 e y = - 4

=  4x² + x.y
= 4.(-1)² + (-1).(-4)
= 4.1 + 4
= 4 + 4
= 8
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3) x = 3

= x² + 4 
= 3² + 4
= 9 + 4
= 13
***********
4)  y = - 5

= y² + 8y
= (-5)² + 8.(-5)
= 25 - 40
= - 15
***********
5) x = 2

x² - 7x + 2
2² - 7.2 + 2
4 - 14 + 2
- 10 + 2
= - 8
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6) a = 7; b = - 1 ; c = - 1

a + b + c

7 - 1 - 1
7 - 2
= 5
************
7) a = 9

a² - 2a = 9² - 2.9   = 81 - 18 = 63 = 21
  √a          √9                 3         3

= 21 
*******************
8) x = 25
x + √x = 25 + √25 = 25 + 5 = 30

= 30
****************

9)  x = 2 ; y = 3

x² + y = 2² + 3 = 4 + 3 = 7
x³ - y      2³ - 3    8 - 3    5

= 7
   5
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10) m = 10

m² - 2m + 7
10² - 2.10 + 7
100 - 20 + 7
80 + 7
= 87
**********************

11) x = 4

1 - x + √x =  1 - 4 + √4 = 1 - 4 + 2 = 1 - 2 =  1 - 8  = - 7
x                 4                 4              4              4         4

x = - 7
       4
**********************

12)  a = 8; x = 10; m = 9
                   ________      _______
√a² + ax   = √ 8² + 8.10 = √64 + 80    =   144 = 16
     m                   9                 9                 9

= 16
************