How do i write a polynomial functions that has roots 3 and 7

Step-by-step explanation:

x^2 - (a+b)x + ab = 0

here, a = 3 and b = 7

hence,

x^2 - (10x) + 21 = 0

lastly , the quadratic equation is

x^2 - 10x + 21 = 0

x=12 units bd= 10 units

step-by-step explanation:

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