Homework Help: algebra

Posted by Marissa on Tuesday, August 14, 2007 at 5:51pm.

1)Solve by factoring:5x^2=4-19x
answer=-4,1/5

2)Which quadratic equation has roots 7 and -2/3?
answer=A
A.2x^2-11x-21=0
B.3x^2-19x-14=0
C.3x^2+23x+14=0
D.2x^2+11x-21=0

3)To solve 4x^2-28x+49=25 by using the square root property,you would first rewrite the equation as
answer=(2x-7)^2=25

4)Find the value of c that makes x^2+5x+c a perfect square trinomial.
answer=25/4

5)The quadratic equation x^2-8x=-20 is to be solved by completing the square.Which equation would be a step in that solution?
answer=x^2-8x+16=-20

#1, ok
#2, I got B roots are 7 and -2/3, so the equation would be (x-7)(3x+2)=0
expand it, and you will get B
#3, ok
#4, ok
#5 ol

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