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√(x + 2)² = 9 .... kedua ruas pangkatkan 2
(x + 2)² = 81
(x + 2) = √81
x + 2 = 9 atau x + 2 = - 9
x = 9 + 2 x = - 9 - 2
x = 11 x = - 11
b) kalikan dengan x(x - 3)
x + 3 (x - 3) = a (x - 3)
x + 3x - 9 = ax - 3a
4x - 9 = ax - 3a
4x - ax = 9 - 3a
x (4 - a) = 9 - 3a
x = (9 - 3a) / (4 - a)
∴ agar x memberikan nilai ⇒ a ≠ 4
c ) disediakan melalui foto di bawah in ...