Question 1191876
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degree=3
real coefficients
zeros at {{{x=2}}} and {{{x=-5+- 5i}}}
y intercept at (0,300)
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{{{y=a(x-2)(x-(-5-5i))(x-(-5+5i))}}}


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{{{y=a(x-2)(x+5+5i)(x+5-5i)}}}

{{{y=a(x-2)((x+5)+5i)((x+5)-5i)}}}

{{{a(x-2)((x+5)^2-(5i)^2)}}}

{{{a(x-2)(x^2+10x+25-(25)(-1))}}}

{{{a(x-2)(x^2+10x+50)}}}

{{{a(x^3+10x^2+50x-2x^2-20x-100)}}}

{{{a(x^3+8x^2+30x-100)}}}


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The point or x-intercept  (0,300),
{{{a(0+0+0-100)=300}}} when substitute for x;
{{{-100a=300}}}

{{{a=-3}}}

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{{{highlight_green(-3(x^3+8x^2+30x-100))}}}
You can continue multiplying that fully if you need to.