x = +5 or -5
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x2 + x - 30 = (x + 6)(x - 5)
x2 + 11x + 30 = 0 (x + 5)(x + 6) = 0 so the roots are -5 and -6
y=x2-10x+30=(x-5)2-25+30=(x-5)2+5
No.
x2+6x+5=0(x+1)(x+5)=0x=-1 and x=-51-6+5=0 and 25-30+5=0 so both answers work.