Question

write the quadratic equation having -4and 5 as its root

Answer 1

x^2 - x - 20......

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Answer 2

let here alpha be a and beta be b
then sum of zeroes
a+b=-4+5===>1
ab  =-4(5)===>-20
quadratic equation 
x^2-(sum of zeroes)x+product of zeroes
x^2-(1)x+(-20)
x^2-x-20