When m = 0.75, n = 0.25, find the value of m-n-178; - m-n-178; + m-n-178; + n

When m = 0.75, n = 0.25, find the value of m-n-178; - m-n-178; + m-n-178; + n

m²-m-n²-n=(m²-n²)-(m+n)=(m+n)(m-n)-(m+n)=(m+n)(m-n-1)=-0.5m²+m-n²+n=(m²-n²)+(m+n)=(m+n)(m-n)+(m+n)=(m+n)(m-n+1)=1.5