Ответ:
[tex]1) x^2+3x-10=(x-2)(x+5)\\\\2) 18x^2-5x-2=(18x+4)(x-0.5)[/tex]
Объяснение:
[tex]1) x^2+3x-10=(x-2)(x+5)\\\\x^2+3x-10=0\\\\D=3^2-4*1*(-10)=9+40=49\\\\x_1=\frac{-3+7}{2} =\frac{4}{2}=2\\\\ x_2=\frac{-3-7}{2}=\frac{-10}{2} =-5\\ \\\\2)18x^2-5x-2=18(x+\frac{2}{9})(x-\frac{1}{2})=(18x+4)(x-0.5) \\\\18x^2-5x-2=0\\\\D=(-5)^2-4*18*(-2)=25+144=169\\\\x_1=\frac{5+13}{36}=\frac{18}{36} =\frac{1}{2}\\\\ x_2=\frac{5-13}{36}=\frac{-8}{36}=-\frac{2}{9}[/tex]
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Verified answer
Ответ:
[tex]1) x^2+3x-10=(x-2)(x+5)\\\\2) 18x^2-5x-2=(18x+4)(x-0.5)[/tex]
Объяснение:
[tex]1) x^2+3x-10=(x-2)(x+5)\\\\x^2+3x-10=0\\\\D=3^2-4*1*(-10)=9+40=49\\\\x_1=\frac{-3+7}{2} =\frac{4}{2}=2\\\\ x_2=\frac{-3-7}{2}=\frac{-10}{2} =-5\\ \\\\2)18x^2-5x-2=18(x+\frac{2}{9})(x-\frac{1}{2})=(18x+4)(x-0.5) \\\\18x^2-5x-2=0\\\\D=(-5)^2-4*18*(-2)=25+144=169\\\\x_1=\frac{5+13}{36}=\frac{18}{36} =\frac{1}{2}\\\\ x_2=\frac{5-13}{36}=\frac{-8}{36}=-\frac{2}{9}[/tex]