Factorise 1. 5-(3a2-2a)(6-3a2+2a)
2. x2-3x-54
3. 2x2-7x-15
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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)
adi11746:
u also dont know man just look at u in the last u simply written answer
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25
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