math
posted by peter .
completing the square
3x^2 +15 33 =0
a=3
b=15
c=33
15+or sqrt2254*3*33/2*3
15+orsqrt225+396/6
is this right because don't you have to subtract not add the 396
please help. thanks

3x²+15x33
a=3, so
=3(x²+5x11)
=3[(x+2.5)²112.5²]
=3[(x+2.5)²(√(17.25))²]
=3(x+2.5+√(17.25))(x+2.5√(17.25)))
So
x=2.5±√(17.25)
which you can also express integers as follows:
x=[5±√(69)]/2
Respond to this Question
Similar Questions

algrebra 2
it is called completing the square here is the equation 4x^24x+1=9 if anyone can help me please do okay i really need ot understand this 4x^24x+1=9 Move the numbers to the other side. 4x^2 4x = 91 4x^2 4x = 8 Now factor out 4 … 
Chemistry
Please could you tell me if I am going in the right direction. I am trying to write molecular formula for As2O3 I make molecular mass 197.8 gas density 17.8 to 3 sig figs 2.0 x density of gas at STP / density of hydrogen 17.8/0.0899 … 
math
x^29x4=6 solve by completing the square show steps plz :D Add 4 to both sides. What is 1/2 of 9? 
math
Traveling at r kilometers for t housrs, a driver will travel rt kilometer. How far will Danny travel in 4 hours at a speed of 99 kilometers per hour? 
Physics
A 0.0160kg bullet traveling horizontally at 396 m/s strikes a 3.95kg block of wood sitting at the edge of a table. The bullet is lodged into the wood. If the table height is 1.06 m, how far from the table does the block hit the floor? 
physicS
A skier is gliding along at 6.93 m/s on horizontal, frictionless snow. He suddenly starts down a 17.2° incline. His speed at the bottom is 29.7 m/s. What is the length of the incline? 
Math
How do you DO THIS? 4+8+12+16+20... +392+ 396+ 400? 
MATH
A PLOT OF RECTANGULAR LAND HAS A WIDTH OF 20 FEET.THE TOTAL SQUARE YARDS ARE 396.WHAT IS THE LENGTH OF THE PLOT 
Math
Find the unit rate 396 km in 6 hr 
Math Inequalities
Riverview Farms sold a combined total of 396 watermelons and cantaloupes. they sold 126 more watermelons than cantaloupes. Use n to represent the number of cantaloupes. Which equation could be used to solve for n?