animelovergirl13
Answered

Find the best answers to your questions at Westonci.ca, where experts and enthusiasts provide accurate, reliable information. Ask your questions and receive detailed answers from professionals with extensive experience in various fields. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

how do you solve x^2+11x+18=0 with either quadratic formula. factoring. or squarerooting

Sagot :

AL2006
I always prefer factoring, if there are simple factors.
There are simple factors here.

x² + 11x + 18 = 0

(x + 2) (x + 9) = 0

The left side is zero if either factor is zero.

First factor:
x + 2 = 0
x = -2

Second factor:
x + 9 = 0
x = -9

 
[tex]quadratic\ formula:\\\\x^2+11x+18=0\\\\a=1;\ b=11;\ c=18\\\\\Delta=b^2-4ac;\ \Delta=11^2-4\cdot1\cdot18=121-72=49\\\\x_1=\frac{-b-\sqrt\Delta}{2a}\to x_1=\frac{-11-\sqrt{49}}{2\cdot1}=\frac{-11-7}{2}=\frac{-18}{2}=-9\\\\x_2=\frac{-b+\sqrt\Delta}{2a}\to x_2=\frac{-11+7}{2\cdot1}=\frac{-4}{2}=-2[/tex]
Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. Thank you for your visit. We're dedicated to helping you find the information you need, whenever you need it. Thank you for choosing Westonci.ca as your information source. We look forward to your next visit.