Question

Please tell me right answer for the following question.
Factorise 15x^2-21x+10​

Answer 1

Answer:

15x² - 21x + 10

3(5x² - 7x + 10)

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Answer 2

Answer:

$\\\qquad\quad\displaystyle\sf {:}\longrightarrow 15x^2-21x+10=0$

$\\\qquad\quad\displaystyle\sf {:}\longrightarrow a=15,b=-21,c=10$

• use quadratic formula

$\boxed{\sf x=\dfrac {-b\underline{+}\sqrt{b^2-4ac}}{2a}}$

$\\\qquad\quad\displaystyle\sf {:}\longrightarrow x=\dfrac {-(-21)\underline{+}\sqrt {(-21)^2-4 \times 15\times 10}}{2\times 15}$

$\\\qquad\quad\displaystyle\sf {:}\longrightarrow x=\dfrac{21\underline{+}\sqrt {441-600}}{30}$

$\\\qquad\quad\displaystyle\sf {:}\longrightarrow x=\dfrac {21\underline{+}\sqrt {-159}}{30}$

• Hence it has no real solutions