math
posted by bob .
1. 4x^213x=12
I need to solve this problem by factoring or using the quadtratic formula. I am stuck when using the quadtratic formula method. Please advise how to do this.
2. 5x^2+42=0
How many roots exist in this equation and what type are they?

math 
drwls
1. 4x^213x 12 = 0
Playing around a bit with the pairs 4&3 and 6&2 as the constants, I get
(4x + 3)(x 4) = 0
That makes the roots x=3/4 and 4
2. x^2 = 42/5
There are two imaginary roots that have an "i" (sqrt(1) factor
Respond to this Question
Similar Questions

math,help
i am stuck with this problem: Problem #12 Solve by using the quadratic formula. 5x^2 + 5x = 3 i am at this step x = (5 (+/) sqrt (85))/(10) you are done! 
Algebra
Hello all  I would like to check my work on 2 problems. Solve by factoring : x^213x= 12 x^213x+12= 12 + 12 x^213x+12= 0 (x1)(x12)= 0 x = 1 , 12 Solve using the square root property: 2x^235=15 2x^23515=0 2x^250=0 2(x5)(x+5)=0 … 
i need help..algebra/math
solve by using the quadratic formula: x2 plus x minus 2 equal 0 I know the formula is a=1 b=1 c=2 I'm having trouble solving...please help. 
math
1. solve by using the quadratic formula. 5x^2+x=3 2. solve by completing the square. x^2=5x+2 3.solve by using the square roots method. 5(x2)^2=3 
algebra
Solve the following equation: k2 + 4k = 0 By factoring and By using the quadratic formula Can someone please help me to understand how to this problem...I do not understand the steps to get the correct answer. Thanks!!! 
Math
I am stuck on a problem that has to do with the double angle formulas. I have to solve this: 4sinxcosx = 1. I tried using the formula 2sinu = 2sinucosu by substituting it in like this: 2(2sinxcosx)= 1 but then I am stuck 
Math
Solve the equation by factoring, by finding square roots, or by using the quadratic formula. 3(x+4)^2= 27 
algebra 2
use quadtratic formula to find any X intercept. y=4x^5x4 
College Algebra 1
Using the factoring method, solve for the roots of quadratic equation 4x^2=16 
Algebra 1
Which method is the best method for solving the equation 8x^2123x+3=0 square roots factoring graphing quadratic formula my answer is quadratic formula