Jawabanmu

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2014-09-10T18:43:47+07:00
a^{2} - b^{2}=40
a-b=4

a-b=4
a=b+4

(b+4)^{2} -  b^{2} =40
(b+4)(b+4)- b^{2} =40
b^{2} +8b+16-b^{2}=40
8b=40-16
8b=24
b=3

a - b =4
a - 3 = 4
a = 7

= a + b
= 7 + 3
= 10
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