Question

5x²=-7x-2

Answer 1

rearrange
5x^ 2 +7x + 2 = 0
Factorising:
(5x +2)(x+1)=0
x = -2/5 , -1

Answer 2

5x²+7x+2=0
D=b^2-4ac
Same way as the other 1

Answer 3

oh! I assumed u wanted to solve it!

Answer 4

if ur factorising it is right u have solved it :)

Answer 5

yeah i know but did tina want to know the value of the determinant?

Answer 6

i have explained her earlier wht should she put instead of a,b and c....she can find the value herself i guess :)

Answer 7

D=49-4*5*2=9
X1=(-b+sqrD)/2a=(-7+3)/2*5=-4/10=-2/5
X2=(-b-sqrD)/2a=(-7-3)/2*5=-10/10=-1 :)

Answer 8

Put the x's to one side

5x² +7x = -2 ; divide out the 5

x^2 + (7/5)x = (-2/5) ; complete the square

x^2 +(7/5)x+ (7/10)^2 = (-2/5) + (7/10)^2 ; clean it up

(x+7/10)^2 = 9/100 ; sqrt the sides

x+7/10 = +- 3/10 ; -7/10

x = -7/10 +- 3/10

x = -10/10 , and x = -4/10

Answer 9

x = -1, and x = -2/5

Answer 10

hmmmm.....i didn't know this way of solving this....(my way is shorter and better anyway :P )

Answer 11

completing the square is how we generalize going from:

ax^2 +bx +c <-> x = (-b +- sqrt(b^2-4ac))/2a

Answer 12

there u go! solving by factorising, the general formula and completing the square!!

Answer 13

they first learn to "complete the square" so that you understand how the quad fromula is derived

Answer 14

otherwise, its simplying teaching to "FOIL" and they learn a memorization technique and remain ignorant about how or why it works :)

Answer 15

right

Answer 16

''Thnx a loot" X(

Answer 17

How do I get to SanJose from here? I dunno, but Ill know when were there lol

Answer 18

U mean u'll know when u'll** be there? O.o