Hi,
1) ax²+2bx+c=0 have real roots then (2b)²-4ac>=0 ==> 4b²>=4ac ==> b²>=ac
2) bx²-2√(ac)x+b=0 have real roots then
(-2√(ac))²-4b²>=0==> 4ac>=4b²==> ac>=b²
So b²>=ac>=b²==> b²=ac

8 0

3 years ago

At M & P’s Deli, two pastrami sandwiches and five sodas cost $12.65, while three pastrami sandwiches and two sodas also cost

Olegator [25]

Answer:

37.95

Step-by-step explanation:

MATH

8 0

2 years ago

Whats the equation for the slopes (-3,12) (5,2)

bazaltina [42]

$m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}} = \frac{2 - 12}{5 - (-3)} = \frac{-10}{5 + 3} = \frac{-10}{8} = -1\frac{1}{4}$

y - y₁ = m(x - x₁)
y - 2 = -1¹/₄(x - 5)
y - 2 = -1¹/₄(x) + 1¹/₄(5)
y - 2 = -1¹/₄x + 6¹/₄
+ 2 + 2
y = -1¹/₄x + 8¹/₄

7 0

3 years ago