# Further Maths HelpWatch

#1
If a quaratic equation has roots (2-i) and (2+i) how do I work out the quadratic equation. I multiplied it out and got 5, but idk where to go from there? Thanks in advance
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#2
bumpppppp
0
3 weeks ago
#3
if and are roots of a quadratic equation then you could write that equation as

As you multiplied your two roots, you acquired your "constant" of the quadratic, now you just need the co-efficient of to complete the equation.
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3 weeks ago
#4
Or alternatively you can just expand (x-2+i ) (x+2 - i )
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3 weeks ago
#5
Sorry it should be (x-2 - i )(x - 2 + i )
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#6
aah i see, thank you! I should have known that, oof I'm tired.
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