Question

Dik a^2-b^2=40dan a-b=4 berapakah nilai a+b

Answer 1

A - b = 4 >> a = b + 4

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

a = b + 4
a = 3 + 4
a = 7

a + b =
= 7 +3 
=10

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