SOLUTION: I don't know how to solve a quadratic equation by graphing. I know how by using the quad. equation. this is the problem I need to solve by graphing. 5x^2 + 20x+15=0
Algebra.Com
Question 658507: I don't know how to solve a quadratic equation by graphing. I know how by using the quad. equation. this is the problem I need to solve by graphing. 5x^2 + 20x+15=0
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
5x^2 + 20x+15=0
5(X^2+4X+3)=0
5(X+3)(X+1)=0
X+3=0
X=-3 ANS.
X+1=0
X=-1 ANS.
PROOFS:
5*-3^2+20*-3+15=0
5*9-60+15=0
45-60+15=0
60-60=0
0=0
5*-1^2+20*-1+15=0
5-20+15=0
20-20=0
0=0
RELATED QUESTIONS
I am having difficulty with this graphing problem because when I enter the equation i get (answered by ewatrrr)
Hi everyone, I need to know how to solve this equation 8x^6+7x^3-1=0 by using the... (answered by xcentaur)
I cannot solve this problem. I know what the answer is because I used a process if... (answered by Earlsdon)
By solving {{{x^4 + 4x^3 -6x^2 -4x +1 = 0 }}} another way, show that the exact value of... (answered by CPhill)
Dear sir/ma'am,
I have a question regarding how to solve Quad. Equations.
My brother... (answered by edjones)
PROBLEM:
SOLVE THE EQUATION BY USING THE QUADRATIC FORMULA.
-x+4x+32=0
HERE I KNOW THE (answered by vleith)
2x2-7x+1=0
I know that the left side of the equation must =-1 but I don’t know how to... (answered by robertb)
I am having so mush trouble trying to figure out first what to do with this problem, I... (answered by ewatrrr)
I need to a step by step solving this equation:0= x^2+15x-1350 , This is from a word... (answered by vleith)