1.

Factorise 3 x square - 20 x-7

Answer»

Here we GO,
3 {x}^{2}  - 20x - 7 \\  = 3 {x}^{2}   - 21x + x - 7 \\  = 3x(x - 7) + (x + 7) \\  = (3x + 1)(x - 7)


And we are DONE.



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