Question

Write the quadratic equation whose roots are 5 and - 9 plz answer i will mark best answer brainliest please​

Answer 1

Answer:

kx²-(a+b)x+ab

kx²+4x-45

when k=1

x²+4x-45

hope it helps

Answer 2

Answer:

$x^2+4x-45=0$

Step-by-step explanation:

When the roots are 5 and -9,

x-5=0 and x+9=0

hence, their product

$(x-5)(x+9)=0$

Expanding,

$x^2+9x-5x-45=0$

or,

$x^2+4x-45=0$

When a quadratic equation is multiplied by any constant, the roots don't change. Hence, it can also be $2x^2+8x-90=0$, or in general,

$c(x^2+4x-45)=0$ can be a possible equation.

Hope it helps.