Question

identify the restricted values
a+2
_______
2a-8

Answer 1

what values for \(a\) would mean the fraction is undefined

Answer 2

any values that make the denominator equal to zero

Answer 3

There's a good trick. Equate the denominator to zero!\[\rm 2a - 8 = 0\]Solve that equation to get your restricted value(s).

Answer 4

right @love1904 , can you find suce an \(a\)?

use Parthy's trick

Answer 5

yeah, I am trying

Answer 6

a=4

Answer 7

Very good!

Answer 8

is there any other value for \(a\) that would make the fraction undetermined ?

Answer 9

-2

Answer 10

lets see what would happen if \(a=-2\)

\[\frac{a+2}{2a-8}=\frac{-2+2}{2(-2)-8}=\frac{0}{-12}=\]

is this fraction defined?

Answer 11

no

Answer 12

@love1904 Only the denominator—not numerator.

Answer 13

when \(a=-2\)\[\frac{a+2}{2a-8}=\frac{0}{-12}=0\]

the fraction equals zero ( it is defined )

Answer 14

Great!! Good Jobs Guys thanks.

Answer 15

so there is only one restricted value for a

Answer 16

another one is coming

Answer 17

Simplify 2t-12
__________________
6-t

Answer 18

factorise the numerator and then cancel