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7.m=(3p+7)(3p+7)-(3p+7)(3p-7)
9p²+21p+21p+49-9p²-21p+21p-49
42p
Seharusnya 42p
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7.(3p+7)²-(3p-7)²
=(9p²+42p+49) - (9p²-42p+49)
=9p²-9p²+42p+42p+49-49
=84p (d.)

8. (ax+b)² = ax² + 2axb + b²
(px+3)² = px² + 2.3.px + 3²
=px² + 6px + 9
30x = 6px
30 = 6p
p = 30:6
p= 5 (a.)