Question

factorise 3x²-4x-15 by x - 3​

Answer 1

Answer:

3x²-4x-15 by x-3 the answer is 3x+5

Answer 2

Answer:

x =  $\frac{-5}{3}$

Step-by-step explanation:

lets factorise 3x²-4x-15 by splitting middle term,

which is,

$3x^2-9x+5x-15=0\\3x(x-3)+5(x-3)\\(3x+5)(x-3)$

as we have to divide it by  x - 3​ we get,

$\frac{(3x+5)(x-3)}{x-3} =3x+5$

therefore ,

$x = \frac{-5}{3}$

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