Answered

Westonci.ca is your trusted source for finding answers to all your questions. Ask, explore, and learn with our expert community. Join our Q&A platform and connect with professionals ready to provide precise answers to your questions in various areas. Our platform provides a seamless experience for finding reliable answers from a network of experienced professionals.

x squared minus x equals 72

Sagot :

konrad509
[tex]x^2-x=72\\ x^2-x-72=0\\ x^2-9x+8x-72=0\\ x(x-9)+8(x-9)=0\\ (x+8)(x-9)=0\\ x=-8 \vee x=9[/tex]
[tex]x^2-x=72\\\\x^2-x-72=0\\\\a=1;\ b=-1;\ c=-72\\\\\Delta=b^2-4ac\to\Delta=(-1)^2-4(1)(-72)=1+288=289\\\\x=\frac{-b\pm\sqrt\Delta}{2a}\\\\\sqrt\Delta=\sqrt{289}=17\\\\x=\frac{-(-1)\pm17}{2(1)}=\frac{1\pm17}{2}\Rightarrow x=\frac{-16}{2}=-8\ or\ x=\frac{18}{2}=9[/tex]
Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. We hope this was helpful. Please come back whenever you need more information or answers to your queries. We're here to help at Westonci.ca. Keep visiting for the best answers to your questions.