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2 years ago

Solve: -5√x= -15 a: x=-9 b: x= -7 c: x=9 d: x=7

Mathematics

2 answers:

Rom4ik [11]2 years ago

7 0

The answer is C: x = 9

babymother [125]2 years ago

4 0

Divide both sides by -5
Sqrt(x) = 3
We want to isolate x to solve for it. The opposite of a square root is a square, so square both sides.
x = 9
It can't be -9 because the square root of negative numbers are not real numbers.

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3 years ago

1. At a fundraiser dinner, the bill for 4 cups of coffee

babymother [125]

1- Writing the system of equations:

The price of a cup of coffee is denoted by c while the price of a spaghetti is denoted by s

We are given that:

4 cups of coffee and 6 spaghetti cost $20.5

This means that:

4c + 6s = 20.5 ................> equation 1

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1 cup of coffee and 3 spaghetti cost $8.75

This means that:

c + 3s = 8.75 .................> equation 2

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3 0

2 years ago

P2 + 4p = 1 Solve by completing square, please help.

Shkiper50 [21]

Answer:

p= -2+√(5) and p= -2-√(5)

Step-by-step explanation:

Given the form ax²+bx = D, you add in b/2 and get:

ax² + bx + (b/2)² = D + (b/2)²

After that, I factored it to (p+2)²=5

Whenever taking a square root, you always get a ± as an answer.

The rest is just algebra

3 0

2 years ago