Jawaban:
a. (3x-2)(4x+5)
= 3x(4x) + 3x(5) - 2(4x) - 2(5) (distributif)
= 12x² + 15x - 8x - 10
= 12x² + 7x - 10
b. (6y+5)(2x-3)
= 6y(2x) + 6y(-3) + 5(2x) + 5(-3) (distributif)
= 12xy - 18y + 10x - 15
c. (x+2)(x-4)
= x(x) + x(-4) + 2(x) + 2(-4) (distributif)
= x² - 4x + 2x - 8
= x² - 2x - 8
d. (2a+1)(3a-7)
= 2a(3a) + 2a(-7) + 1(3a) + 1(-7) (distributif)
= 6a² - 14a + 3a - 7
= 6a² - 11a - 7
Penjelasan dengan langkah-langkah:
maaf bukan sepuh
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Verified answer
Jawaban:
a. (3x-2)(4x+5)
= 3x(4x) + 3x(5) - 2(4x) - 2(5) (distributif)
= 12x² + 15x - 8x - 10
= 12x² + 7x - 10
b. (6y+5)(2x-3)
= 6y(2x) + 6y(-3) + 5(2x) + 5(-3) (distributif)
= 12xy - 18y + 10x - 15
c. (x+2)(x-4)
= x(x) + x(-4) + 2(x) + 2(-4) (distributif)
= x² - 4x + 2x - 8
= x² - 2x - 8
d. (2a+1)(3a-7)
= 2a(3a) + 2a(-7) + 1(3a) + 1(-7) (distributif)
= 6a² - 14a + 3a - 7
= 6a² - 11a - 7
Penjelasan dengan langkah-langkah:
maaf bukan sepuh