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= (a+b) (a-b)
40 = (a+b) . 4
10 = (a+b)
jawab= 10
bentuk a-b diubah menjadi a=4+b
bentuk a²-b²=40
(16+8b+b²)-b²=40
16+8b+b²-b²=40
16+8b=40
8b=40-16=24
b=24 dibagi 8=3
a=a+b
a+b=4
a=4+b
a=4+3=7
Jadi, nilai a+b=7+3=10