Question

Factorise each of the following: 125a² – 45b² using identites​

Answer 1

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Answer 2

Answer:

(25a+6.7b)(25a-6.7b)

Step-by-step explanation:

We will use Identity (a+b)(a-b) = a²-b²,

${125a}^{2} - {45b}^{2} = {a}^{2} - {b}^{2}$

$= {125a}^{2} - {45b}^{2} =( a + b)(a - b)$

Now we will insert the values as,

125=(5)² and 45=(6.7)²

so,

$=( 25a + 6.7b)(25a - 6.7b)$

which is your answer....

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