panda557
panda557
03-06-2016
Mathematics
contestada
What is x^2+x-20=0.
please help
Respuesta :
meerkat18
meerkat18
03-06-2016
x² + x - 20 = 0
x² = x * x
x = the sum of the factors of -20
-20 ⇒ 1 x 20
2 x 10
- 4 x 5 ⇒ only these factors can arrive to a sum of 1
(x - 4)(x + 5) = x(x+5) - 4(x+5) = x² + 5x - 4x - 20 = x² + x - 20
x - 4 = 0
x = 4
x + 5 = 0
x = -5
Answer Link
VER TODAS LAS RESPUESTAS ( 64+ )
Otras preguntas
12. State whether the number 97 is prime, composite, or neither.
a line passes through the points (-2,-7) and (-3,1) . find the slope and slope intercept form how do i find the slope and slope intercept form ?
Had pizza at a party Stacey ate 1/3 of a pizza Alexa had on1/2 tenaya 3/8Natalie had4/6 which friend ate the least amount of pizza?
Which graph represents the solution set for the inequality -8 < 8 + 4x < 28
What did the Laputans clothes look like
Which is the best buy? A. $10.88 for 7 cans of tuna B.$11.55 for 6 cans of tuna C.$17.25 for 9 cans of tuna D.$15.31 for 8 cans of tuna Determine which rat
Antivirus software products require that you update _____ on a regular basis. a. hard drives b. user names c. passwords d. virus definitions
Ricky charges $28 a week to cat sit and $45 a week to dog sit. Starting next Monday, he is pet sitting for 5 cats and 1 dog for a week. How much money will he e
Which of the following is an example of cultural diffusion in the region? A. requiring strict adherence to Sharia B. women pursuing careers outside the home
Natural gas, or methane, is an important fuel. Combustion of one mole of methane releases 802.3 kilojoules of energy. How much energy does that represent in kil
