Matematika

Pertanyaan

a. (x+4)² + (x-4)² b. (5-y)² - (5y-1)²

1 Jawaban

  • a. (x+4)² + (x-4)²
    = (x+4)(x+4) + (x-4)(x-4)
    = x² + 8x + 16 + x² - 8x + 16
    = x² + x² + 8x - 8x + 16 + 16
    = 2x² + 32.

    b. (5-y)² - (5y-1)²
    = (5-y)(5-y) - (5y-1)(5y-1)
    = 25 - 10y + y² - 25y² - 10y + 1
    = 25 + 1 - 10y - 10y + y² - 25y²
    = 26 - 20y - 24y².

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