Ac method
for y=ax^2+bx+c
the ac method is normally used for when a≠1
it is used as an aid to help factor
so
0=1x^2-8x+15
multiply a and c (1 times 15=15)
what 2 numbers mulitply to get 15 and add to get -8?
-3 and -5
split the middle up to that
0=1x^2-3x-5x+15
group
0=(x^2-3x)+(-5x+15)
undistribute
0=x(x-3)-5(x-3)
undistribute (x-3)
0=(x-5)(x-3)
set to zero
x-5=0
x=5
x-3=0
x=3
solutions are x= 3 and 5
Answer:
1/8
Step-by-step explanation:
The slope of a line given two points is found by
m = (y2-y1)/ (x2-x1)
= (-2 - -3)/(4 - -4)
= (-2 +3)/(4+4)
1/8
Answer:
a) -19/2
Step-by-step explanation:
3(x+6)+6x+9=7x+8
3x + 18 + 6x + 9 = 7x + 8
3x + 6x - 7x = 8 - 18 - 9
2x = -19
2x/2 = -19/2
Therefore, x = -19/2
