1.

Factorise 5x² + x-4​

Answer»

= 5 {x}^{2}  + x - 4  \\\\ = 5 {x}^{2}  + (5 - 4)x - 4 \\\\ = 5 {x}^{2}  + 5x - 4x - 4 \\ \\ = 5x(x + 1) - 4(x + 1) \\\\  = (x + 1)(5x - 4)



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