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= a²-b²
2.(a+b)² = (a+b)(a+b)
= a²+ab+ab+b²
=a²+2ab+b²
(a-b)² = (a-b)(a-b)
=a²-ab-ab+b²
=a²-2ab+b²
(ax+b)(cx+d) = acx²+adx+bcx+bd
3. a²-b²= 40
a-b=4
berapa nilai a+b?
....²-...².=40
....-....= 4
7²-3²=40
7-3= 4
jadi a+b= 7+3 =10