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(3x-4)(3x-4) = 3x(3x-4)-4(3x-4)
= 9x^2-12x-12x+16
= 9x^2-24x+16
a=9, b=-24, c=16
2a-3b-4c = 2(9)-3(-24)-4(16)
= 18+72-65 = 25
9)
(a^2/x) × (5b^2/yz) : (5ab^2/xyz)
= (5a^2b^2 / xyz) × (xyz/5ab)
= ab