2x^2+20x=-38 divide both sides by 2
x^2+10x=-19, halve the linear coefficient, square it, than add that value to both sides of the equation, in this case add (10/2)^2=25...
x^2+10x+25=6 now the left side is a perfect square
(x+5)^2=6 take the square root of both sides
x+5=±√6 subtract 5 from both sides
x=-5±√6 (so answer c.)
It is 2.4 because the ratio is 5:4 so when you apply that to lines DA and EC you would get 2.4
Answer:
4 inches
Step-by-step explanation:
a parallelogram's area is represented by the equation l * h where l is the length and h is the height
the length is 10 the height is h and area is 40 so we can do this
10h = 40
h = 4
Answer:
16, 8, 23
Step-by-step explanation:
2x+x+x+15=47
4x+15=47
4x=32
x=8
2x=16
x+15=23