S o l v e   ( v i i i )   x 2 - 9 x 2 ( i x )   4 x 2 y - y 3 9 x 2

Dear student
viii)x2-9x2=x2-3x2=x-3xx+3x   using a2-b2=a+ba-bv)y22-8z2=y22-222z2=y22-22z2=y2-22zy2+22z    using a2-b2=a+ba-b
Similarly try other.
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