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Descompuneți în factori trinomul de gradul II: a) x²-8x+12; e) b) x²-13x+30; x²+11x+18; f) x²-11x-26; i) 6x² +19x-7; j) 3x² +8x+4; c) x²-13x+40; d) x²+10x-11; h) 2x²+5x-3; g) x²-9x-70; k) 4x²-19x+12; 1) 10x²-11x-6.​

Răspuns :

Răspuns:

[tex]a[/tex]) x² - 8x + 12 = x² - 2x - 6x + 12 = x(x - 2) - 6 (x - 2) = (x - 2)(x - 6)

b) x² - 13x + 30 = x² - 3x - 10x + 30 = x(x - 3) - 10(x - 3) = (x - 3)(x - 10)

c) x² - 13x + 40 = x² - 5x - 8x + 40 = x(x - 5) - 8(x - 5) = (x - 5)(x - 8)

d) x² + 10x - 11 = x² -x + 11x - 11 = x(x - 1) + 11(x - 1) = (x - 1)(x + 11)

e) x² + 11x + 18 = x² + 2x + 9x + 18 = x(x + 2) + 9(x + 2) = (x + 2)(x + 9)

f) x² - 11x - 26 = x² + 2x - 13x - 26 = x(x + 2) - 13(x + 2) = (x + 2)(x - 13)

i) 6x² + 19x - 7 = 6x² - 2x + 21x - 7 = 2x(3x - 1) + 7(3x - 1) = (3x - 1)(2x + 7)

j) 3x² + 8x + 4 = 3x² + 6x + 2x + 4 = 3x(x + 2) + 2(x + 2) = (x + 2)(3x + 2)

h) 2x² + 5x - 3 = 2x² - x + 6x - 3 = x(2x - 1) + 3(2x - 1) = (2x - 1)(x + 3)

g) x² - 9x - 70 = x² + 5x -14x - 70 = x(x + 5) - 14(x + 5) = (x + 5)(x - 14)

k) 4x² - 19x + 12 = 4x² - 3x - 16x + 12 = x(4x - 3) - 4(4x - 3) = (4x - 3)(x - 4)

l) 10x² - 11x - 6 = 10x² - 15x + 4x - 6 = 5x(2x - 3) + 2(2x - 3) = (2x - 3)(5x + 2)