1.

Factorisation of 5a2-20a​

Answer»

Explanation:

simplyfing the first EQUATION:

having a COMMON FACTOR "a"

a(5a+20)

simplifying The denominator:

having a common factor "

a

2

"

a

2

(a-2)

Moving to the second equation:

The numerator:

a

2

-a- 12

This equation cannot be solved by the common factor method, because -12 has no "a".

However, It can be solved by another method:

opening 2 different parenthesis

(a-4).(a+3)

The dominator:

having the POWER common factor

(

a

−

4

)

2


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