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(a-b)² = (a-b) x ( a-b ) = a²b²
2.(a) (a+b)(a+b) = a²+ab+ab+b² = a²+ab²+²b²
(b) (a-b)(a-b)=a²-ab-ab+b²=a²-2ab+b²
(c) ²acx²+ad+bcx+bd
3. diket : a²-b²=40
a-b=4
dijawb :
a-b=4
a=4+b
a²-b²=40
(4+b)²-b²=40
16+4b+4b+b²-b²=40
16+8b=40
8b=40-16
8b=24
b=24÷8=3
a+b=7+3=10