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a = 4

Step-by-step explanation:

Lets call a² the side a

Let's call b² the side with 3

The hypotenuse, the longest side and the opposite side from the 90° angle is c²

a² + b² = c²

a² + 3² = 5²

a² + 9 = 25

subtract 9 from both sides

a² = 16

sq root 16 = 4

a = 4

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-Chetan K

x² - 3x + 2

Step-by-step explanation:

(x - 2) (x - 1)

= x (x - 1) -2 (x - 1)

=x² - x - 2x + 2

= x² - 3x + 2