algebra
posted by Marissa .
1)Solve by factoring:5x^2=419x
answer=4,1/5
2)Which quadratic equation has roots 7 and 2/3?
answer=A
A.2x^211x21=0
B.3x^219x14=0
C.3x^2+23x+14=0
D.2x^2+11x21=0
3)To solve 4x^228x+49=25 by using the square root property,you would first rewrite the equation as
answer=(2x7)^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^28x=20 is to be solved by completing the square.Which equation would be a step in that solution?
answer=x^28x+16=20
#1, ok
#2, I got B roots are 7 and 2/3, so the equation would be (x7)(3x+2)=0
expand it, and you will get B
#3, ok
#4, ok
#5 ol
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