rebeccaisthefamous1 rebeccaisthefamous1
  • 15-08-2019
  • Mathematics
contestada

Helppppp plsssss!!!!!

Helppppp plsssss class=

Respuesta :

Аноним Аноним
  • 15-08-2019

X^2 + 2x -4= 0

You need to remember one standard result

ax^2 + bx + c= 0

[tex]x = \frac{ - b + - \sqrt{ {b}^{2} - 4ac} }{2a} [/tex]

By Comparing the coefficients,

a= 1, b=2, c=-4

[tex]x = \frac{ - 2 + - \sqrt{ {2}^{2} - 4 \times 1 \times - 4 } }{2 \times 1} \\ x = \frac{ - 2 + - \sqrt{4 + 16} }{2} \\ \\ x = \frac{ - 2 + - \sqrt{20} }{2} \\ \\ x = \frac{ - 2 + - 2 \sqrt{5} }{2} \\ \\ x = - 1 + - \sqrt{5} [/tex]

Options A ,C

Answer Link

Otras preguntas

Which verb form correctly completes the sentence? Earlier, when Bruce arrived, I noticed that he _____ his shirt. A. torn B. had torn C. tear D. had tore
Which religious movement was joined by organized labor to improve work-related concerns
what is the percentage of 18/20
35.99 million as mixed in simplest form
Pizza Perfection sold 93 pizzas on Monday, 67 pizzas on Tuesday, 78 pizzas on Wednesday, 44 pizzas on Thursday, and 123 pizzas on Friday. On average, how many p
risk and wages in a sentence
which number is farther from 0 on a number line: -9 or 6?
The Anti-Federalists’ main objection to ratifying the Constitution was that it
Prove that 3:8 is equivalent to 12:32
Adverbs can modify all of the following except A)Verbs B)Adjectives C)other Adverbs D) Nouns