1.

(b) Factorize `7 -17x - 12x^(2)`

Answer» Here, `(7) (-12) = -84 = (-21) (4) and -17 = -21 + 4`
`7 - 17x - 12x^(2)`
`=7 -21x + 4x - 12x^(2)`
`= 7 (1-3x) + 4x (1- 3x) = (1- 3x) (7 + 4x)`


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