15. Factorise 2x2 + 9x +4 by splitting the
middle term.
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2x² + 9x +4 = 0
2x² + 8x + x+ 4 = 0
2x(x+4) + 1 (x+4) =0
(2x+1) (x+4) = 0
x= -4 or x = -1/2
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