Question

please tell this with written in copy
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Answer 1

I think this should be the answer

Hope it helps ^_^

I don't think that you will have some problem with typed text

I have solved only the ticked ones

(a)

$4x^2 - 9y^2\\= [(2x)^2 - (3y)^2]$

We can see that this is forming the expansion formula of $(a^2 - b^2)$

$a^2 - b^2 = (a+b) (a-b)\\= (2x)^2 - (3y)^2 = (2x + 3y) (2x - 3y)$

∴ $(2x + 3y) (2x-3y)$ Ans.

(b)

$(4a + b)^2 - (a + 3b)^2$

If we look carefully, we can see that they are forming the expansion formula of  $a^2 - b^2$

$a^2 - b^2= (a +b) (a-b)$

$= [4a +b + a + 3b] [4a + b - (a+3b)]\\= (5a + 4b) [4a +b - a - 3b]\\= (5a + 4b) (3a - 2b)$

∴ $(5a + 4b) ( 3a - 2b)$ Ans.

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