Answer:
Step-by-step explanation:
hello :
5x²+8x-4 quadratic expression when : a = 5 and b=8 and c= -4
∆ = b²-4ac ∆ = 8²-4(5)(-4) = 64 +80 = 144 = 12²
X1 = ( -b -√∆)/2a X1 = (-8-12)/10 = -20/10= -2
X2 =(-b+√∆)/2a X2 = (-8+12)/10 = 4/10 = 2/5
us factorisation : a(X-X1)(X-X2)
5x²+8x-4= 5(x+2)(x-2/5) = (x+2)(5x-2)
you can verify ; (x+2)(5x-2) = 5x²-2x+10x-4 = 5x²+8x-4
Answer:
15
Step-by-step explanation:
3/5 = x/25
x = 15
Step-by-step explanation:
24 ÷ 3:4
= 24 / 3 / 4
Basics
a / b / c = a / b / c / 1
....1 is normally invisible since a number
divided by 1 is itself. i wrote 1 down to show the reciprocal property.
a/b/c/1 = a/b × 1/c = a/bc ...Flip the number you're dividing with.
24/3/4 = 1/24 × 3/4 = 3 / 96 = 3 × 1 / 3 × 32 ...cancel the 3s'
= 1 / 32.
Answer:
points 
30
Step-by-step explanation:
If you need at least 30 points, that means that you can have 30 points or more. Therefore, the correct answer would use greater than or equal to.
It should be B. And it'll look something like this; 8c+8a =8,400
a= 2c + 50
