Hello :
$\frac{5}{a} - \frac{2}{1-a} = \frac{2}{a-1} = \frac{5}{a}+ \frac{2}{a-1} = \frac{2}{a-1}
= \frac{5(a-1)+2a}{a(a-1)} = \frac{2a}{a(a-1)} 
(a \neq 1 , a \neq 0)
$
5a-5 +2a =2a
5a =5
a=1 ( refused)
conclusion : none

8 0

3 years ago

Complete the pattern 4,15,7,12,10,9 ? ? ? show me how you got your work

kkurt [141]

Given the pattern:
4,15,7,12,10,9,..
Every other term after the first term is increasing by 3. Thus continuing the pattern we shall have:
4, 15, 7, 12, 10, 9, 13, 11,16
thus the missing numbers will be:
13,11,16

6 0

3 years ago

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Factor completely: 81x4 – 81 (9x2 + 9)(9x2 – 9) (3x + 3)2(3x – 3)2 (3x + 3)(3x – 3) (9x2 + 9)(3x + 3)(3x – 3)

Eduardwww [97]

Last voice (9x^2+9)(3x-3)(3x+3)

7 0

3 years ago

Read 2 more answers