Divide each side of the equation by 10 .
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Rearrange: x2 - 10x + 25 = 0ie (x - 5)(x - 5) = 0x = 5Check: x2 = 25; 10x - 25 = 50 - 25 = 25. Job done
10x - 5 = 2510x = 30x = 3
-20
y=x2-10x+30=(x-5)2-25+30=(x-5)2+5
x2 + 10x + 25 = 0