Jawab:
1. x^2 + 6x + 9 x = -2 + √3
= (-2 + √3)^2 + 6(-2 + √3) + 9
= [(-2 + √3) x (-2 + √3)] + (-12 +6√3) + 9
= [4 - 2√3 - 2√3 + 3] - 12 + 6√3 + 9
= 4 - 4√3 + 3 - 12 + 6√3 + 9
= -4√3 + 6√3 + 4 + 3 - 12 + 9
= 2√3 + 4
4. x^2 + 9x + 18 = 0
= x^2 + 6x + 3x + 18
= x(x + 6) + 3(x + 6)
= (x + 3) (x + 6)
x + 3 = 0 | x + 6 = 0
x = -3 | x = -6
jadi nilai x = -3 atau x = -6
7. (x - 3)^2 = x^2 - 6y + 9
(x - 3)(x - 3) = x^2 - 6y + 9
x^2 - 3x - 3x + 9 = x^2 - 6y + 9
x^2 - 6x + 9 = x^2 - 6y + 9
x^2 - x^2 - 6x + 6y + 9 - 9 = 0
-6x + 6y = 0
-x + y = 0
tandai jawaban ini sebagai jawaban terbaik agar yang lain bisa ikut menambah ilmu
terimakasih
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Jawab:
1. x^2 + 6x + 9 x = -2 + √3
= (-2 + √3)^2 + 6(-2 + √3) + 9
= [(-2 + √3) x (-2 + √3)] + (-12 +6√3) + 9
= [4 - 2√3 - 2√3 + 3] - 12 + 6√3 + 9
= 4 - 4√3 + 3 - 12 + 6√3 + 9
= -4√3 + 6√3 + 4 + 3 - 12 + 9
= 2√3 + 4
4. x^2 + 9x + 18 = 0
= x^2 + 6x + 3x + 18
= x(x + 6) + 3(x + 6)
= (x + 3) (x + 6)
x + 3 = 0 | x + 6 = 0
x = -3 | x = -6
jadi nilai x = -3 atau x = -6
7. (x - 3)^2 = x^2 - 6y + 9
(x - 3)(x - 3) = x^2 - 6y + 9
x^2 - 3x - 3x + 9 = x^2 - 6y + 9
x^2 - 6x + 9 = x^2 - 6y + 9
x^2 - x^2 - 6x + 6y + 9 - 9 = 0
-6x + 6y = 0
-x + y = 0
tandai jawaban ini sebagai jawaban terbaik agar yang lain bisa ikut menambah ilmu
terimakasih