Question

a) 4x² +20x-11
b) 9x²+24x-33
c) 3x²+7x+4
f) 5x²+8x+3 Dau funda!!
Sunt din lectia Metode combinate de descompunere in factori. (clasa 7)

Answer 1

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Answer 2

a)  4x² + 20x + 25 - 36 = (2x+5)² - 6² = (2x+5-6)(2x+5+6) = (2x-1)(2x+11)
b)  9x² +24x + 16 - 49 = (3x+4)² - 7² = (3x+4-7)(3x+4+7) = 3(x-1)(3x+11)
c)  3x² +3x +4x +4 = 3x(x+1) +4(x+1) = (x+1)(3x+4)
f)  4x² +8x+ 4 + x² - 1 = 4(x+1)² + (x+1)(x-1) = (x+1)(4x+4+x-1) = (x+1)(5x +3)