Разложите ** множители: 1. ) x^2+x-6 2.) 2x^2-x-3

Question

Разложите на множители:
1. ) x^2+x-6
2.) 2x^2-x-3

Answer 1

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Answer 2

1) x^2 + x - 6 = ( x - 2)(x + 3)
D = b^2 - 4ac = 1 + 24 = 25 = 5^2
x1 = ( - 1 + 5) / 2 = 2
x2 = ( - 1 - 5) / 2 = - 3

2) 2x^2 - x - 3 = (x + 1)(2x - 3)
D = b^2 - 4ac = 1 + 24 = 25 = 5^2
x1 = ( 1 + 5) / 4 = 1,5
x2 = ( 1 - 5) / 4 = - 1