Solve by using tables. Give each answer to at most two decimal places. –2x2 – 4 = –8x (1 point) 0.59, 3.41 –3.41, –0.59 1.17, 6.83 –1.41, 1.41

Question

Solve by using tables. Give each answer to at most two decimal places. –2x2 – 4 = –8x  (1 point)      0.59, 3.41     –3.41, –0.59     1.17, 6.83     –1.41, 1.41

lilai3 · Answer

congrats on ur first question

anonymous · Answer

Thanks. Do you know the answer to this?

campbell_st · Answer

you need to rewrite the equation to make it easy... and let it equal zero

$$2x^2 -8x + 4 = 0$$

which will become 

$$2(x^2 -4x + 2 )= 0$$

you need to solve 

$$x^2 -4x + 2 = 0$$

by completing the square or the general quadratic formula.

anonymous · Answer

Not to sound stupid or anything, but what is the general quadratic formula?

campbell_st · Answer

a method for solving a quadratic that can't be factorised.... and I'm curious about using tables to solve this...

campbell_st · Answer

the general quadratic formula is use for a quadratic

$$ax^2 + bx + c = 0$$

which is written the the general equation the you use

$$\ x=\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$

anonymous · Answer

Thanks.

campbell_st · Answer

reading your question again... I think that they want you to substitute to find the solution s


e.g. 

x. 0.59

is

-2(0.59)^2 - 4 = 8(0.59)

campbell_st · Answer

if it is then that will be the solution pair

anonymous · Answer

Solve by using tables. Give each answer to at most two decimal places.
–2x2 – 4 = –8x  (1 point)
  (1 pt) 0.59, 3.41
  (0 pts) –3.41, –0.59
  (0 pts) 1.17, 6.83
  (0 pts) –1.41, 1.41
1 /1 point