Please solve q 14 is of Factorisation

Please solve q 14 is of Factorisation 5a(a — b) + — b) + '(a — b) 13. 120r-2y)2-3x+2y-l Let 3x — 2y = a Given expression 12a2 — a — 1 and 14. 3Y)2-8x+ 12y-3 15. 3 —5.r+5y— 12(x —y)2 16. 9.r2 + 3.r — Sy — 64y2 17. 18. — (a + b)2— 16 19. 2(ab + d2 20. Find the value of : (i) (987)2 - (ii) (67-8)2 -

4(2x-3y)^2-8x+12y-3

= 4(2x-3y)^2-4(2x-3y)-3

Substituting (2x-3y) as A,

We get

4A^2-4A-3

= 4A^2-6A+2A-3

​= 2A(2A-3)+1(2A-3)

= (2A+1)(2A-3)

Putting the value (2x-3y) in place of A,

We get

{2(2x-3y)+1}{2(2x-3y)-3}

= (4x-6y+1)(4x-6y-3)

Hope this helps.
 
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