Question

One of the zeros of polynomial x²+7x+12 when x=-2/5 is 0​

Answer 1

Answer:

$\sf \: { \boxed{\blue{{Given}}}}$

$\sf \: x {}^{2} + 7x + 12 = 0$

$\sf \: (x + 3) \: (x + 4) = 0$

$\pink{\sf \: x = - 3, - 4}$

Verification:-

$\sf \: Sum \: of \: Root \: = \red{- \frac{b}{a} = - \frac{7}{1} = - 7}$

$\sf \: Product \: of \: Root \: = \pink{\frac{c}{a} = \frac{12}{1} = 12}$

Hence proved