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= (7p²-4p²) (7p²-4p²)
= 49p²-28p²-28p²+16p²
= 9p²
12) (2m-½)²
= (2m-½) (2m-½)
= 4m²-1-1+1
= 4m²-1
13) (4m+1/m)²
= (4m+1/m) (4m+1/m)
= 8m²+4+4+1m²
= 9m²+8
14) (3m-½)²
= (3m-½) (3m-½)
= 9m²-1,5m-1,5m+1
= 9m²-3m+1
15) (x+4) (x+4)
= x²+4x+4x+16
= x²+8x+16
16) (3x-5) (3x-5)
= 9x²-15x-15x+25
=9x²-30x+25
17) (y+1) (y+1)
= y²+y+y+4
= y²+2y+4
18) (3y+4) (3y+4)
= 9y²+12y+12y+16
= 9y²+24y+16
19) (4y-5) (4y-5)
= 16y²-20y-20y+25
=16y²-40y+25