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⇒ (a+b)(a-b) = a²-ab+ab-b² = a²-b²)
⇒ (a+b)(a+b) = a²+ab+ab+b² = a²+2ab+b²
⇒ (a-b)(a-b) = a²-ab-ab+b² = a²-2ab+b²
nih jawabannya kalogitu :
2. x² - 49 = (x-7)(x+7)
3. 9x² - 4y² = (3x-2y)(3x+2y)
4. 2x²+4x-6 = ini biar mudah, semuanya dibagi 2 dulu. jadi x²+2x-3 = (x+3)(x-1)
5. 3x²-27 = ini biar mudah, semuanya dibagi 3 dulu. jadi x²-9 = (x+3)(x-3)
6. x²-144 = (x+12)(x-12)
7. x²+x-72 = (x+9)(x-8)
8. 3x²-10x-8 = (3x+2)(x-4)