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2 years ago

Let a Δ b = (a+b)2+5. what is 1 Δ - 4?

Mathematics

1 answer:

Arturiano [62]2 years ago

5 0

It looks like ∆ is defined as

a ∆ b = (a + b)² + 5

If that's the case, then

1 ∆ (-4) = (1 + (-4))² + 5 = (-3)² + 5 = 9 + 5 = 14

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Help please!! i don’t understand this one!

12345 [234]

Answer:

C, D

Step-by-step explanation:

This equation can be solved any of several ways. One that doesn't require much thought is using the quadratic formula.

For ax² +bx +c = 0, the solutions are ...

$x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

In the given equation, a=2, b=11, c=5, so this becomes ...

$x=\dfrac{-11\pm\sqrt{11^2-4\cdot2\cdot5}}{2\cdot2}=\dfrac{-11\pm\sqrt{81}}{4}\\\\x=\dfrac{-11\pm9}{4}=\left\{-\dfrac{20}{4},-\dfrac{2}{4}\right\}=\{-5,-\frac{1}{2}\}$

The solutions are ...

C. x = -5

D. x = -1/2

_____

My personal favorite is using a graphing calculator. The solutions are the x-intercepts of the expression on the left. That is, where its value is zero, as the equation says.

5 0

3 years ago

PLEASE HELP Determine W and X in Circle M

e-lub [12.9K]

your answer will be

w=16°

X=148°

Step-by-step explanation:

hope it helps you

have a great day!!

8 0

3 years ago

V/199 is between...?

MissTica

I think E but I’m probably wrong???

7 0

3 years ago

Find the value of y in the equation

iren2701 [21]

We want to find y from the equation
$\frac{3}{y-2} =8$

Multiply each side by (y - 2).
$(y-2).( \frac{3}{y-2)}) = 8(y-2)$
Note that (y-2) in the numerator and denominator cancel out on the left side.
Therefore
3 = 8(y - 2)
3 = 8y - 16
Add 16 to each side.
3 + 16 = 8y - 16 + 16
19 = 8y
Divideach side by 8.
19/8 = y

Answer: $y= \frac{19}{8}$

4 0

3 years ago

Maya earns 43 dollars per week working part-time at a book store. She makes one dollar more for each book that she sells. The am

natima [27]

Answer:

Step-by-step explanation:

It says that Maya makes one dollar more for each book that she sells so if she sells 13 books, she will make 13 dollars more than her weekly earning which is 43 dollars. So to find the answer, you would need to add 13 + 43 which would equal 56 dollars.

3 0

3 years ago