factorise xsquared-30x-31.2

x(squared)-30x-31.2=0

(x    ?)(x   ?)
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1 Answer

x^2 -30x -31.2 become

(x-31.0062488)*(x+1.0062488)

from quadratik...-b/21=15, b^2-4ac=1024.8

root(1024.8)=32.01249756
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