Please help me with Q1 c part

Dear Student,
-10(h-g)2 + 5(g-h)= 5(g-h) - 10(h-g)2 = 5(g-h) - 10(g-h)2 = (g-h) [ 5 - 10(g-h)]= (g-h) [ 5-10g + 10h]
Regards,

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