(x-3) ²=x²+15 tolong plisss

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(x-3) ²=x²+15 tolong plisss

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(x – 3)² = x² + 15
=> (x – 3)(x – 3) = x² + 15
=> x² – 3x – 3x + 9 = x² + 15
=> x² – 6x + 9 = x² + 15
=> x² – x² – 6x + 9 – 15 = 0
=> – 6x – 6 = 0
=> – 6x = 6
=> x = 6 ÷ (- 6)
=> x = – 1

Sorry Kalau Salah

(x-3)(x-3)=x²+15
x²-3x-3x+9=x²+15
x²-6x+9=x²+15
x²-x²-6x=15-9
-6x=6
x=-1