Question

wykonaj dzialania
a) x-3 2x+8
⁻⁻⁻⁻⁻⁻⁻ × ⁻⁻⁻⁻⁻⁻⁻ c) x²+3x-4 2x-8
x+4 3x-9 ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ × ⁻⁻⁻⁻⁻⁻⁻⁻⁻
3x-3 x²-16
b) x²-9 x²-49
⁻⁻⁻⁻⁻⁻⁻⁻ × ⁻⁻⁻⁻⁻⁻⁻⁻⁻
x+7 3x+9

Answer 1

a)

(x-3)/(x+4) *(2x+8)/(3x-9) =

= (x-3)/(x+4) *2(x+4)/3(x-3) =

= 2/3

b)

(x^2 -9)/(x+7) *((x^2 -49)/(3x+9) =

= (x+3)(x-3)/(x+7) *(x+7)(x-7)/3(x+3) =

= (x-3)(x-7)/3

c)

(x^2 +3x-4/(3x-3) *(2x-8)/(x^2 -16) =

=(x^2 +3x-4)/(3x-3) * 2(x-4)/(x+4)(x-4) =

=(x^2 +3x-4)/(3x-3) * 2/x+4) =

=2(x^2 +3x-4)/(3x^2 +12x-3x-12) =

=2(x^2 +3x-4)/3(x^2 +3x-4) =

= 2/3