Math, asked by babitatanishq, 1 year ago

Factorise 1. 5-(3a2-2a)(6-3a2+2a)
2. x2-3x-54
3. 2x2-7x-15

Answers

Answered by danielochich
11

1. 5-(3a2-2a)(6-3a2+2a) 

= 5 – (18a^2 – 9a^4 + 6a^3 – 12a + 6a^3 – 4a^2)

 

= 5 – (– 9a^4 + 6a^3 + 6a^3+ 18a^2 – 4a^2– 12a)

 

= 5 – (– 9a^4 + 12a^3 + 14a^2 – 12a)

 

= 9a^4 - 12a^3 - 14a^2 + 12a + 5

 

= (a+1)(3a+1)(a−1)(3a−5)

 

2. x2-3x-54

 

= x2 + 6x – 9x – 54

 

= x(x+6) -9(x + 6)

 

= (x+6)(x−9)

 

3. 2x2-7x-15

 

= 2x2 -10x+3x-15

 

= 2x(x-5) + 3(x-5)

 

=(2x+3)(x−5)


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Answered by subhamnayak83
25

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