4 years ago

PLS help and explain these problems

Mathematics

1 answer:

vichka [17]4 years ago

6 0

For 19 I got z=15. And for 20 I got k=8.6

You might be interested in

Help me pls!!!!!!!!!

Dominik [7]

Answer:

$x^2+18=-9x : x = -3, x = -6$

Step-by-step explanation:

$x^2+18=-9x$

Add 9x to both sides:

$x^2+18+9x=-9x+9x$

Simplify:

$x^2+9x+18=0$

Solve with the quadratic formula:

For a quadratic equation of the form $ax^2+bx+c=0$ the solutions are:

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

For $a=1,\:b=9,\:c=18:\quad x_{1,\:2}=\frac{-9\pm \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1}$

$x =\frac{-9 + \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1} : -3$

$x =\frac{-9 - \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1} : -6$

The solution to the quadratic equation are:

$x=-3,\:x=-6$

Hope I helped. If so, may I get brainliest and a thanks?

Thank you, have a good day!

6 0

3 years ago

X2 + 13x = -22 solve for x

aliya0001 [1]

I believe the answer would be -2 and -11 hope this helped!

3 0

3 years ago

Jackson has a credit card with a balance of $6,999. What will his minimum payment be if it is 3.5% of the balance?

Deffense [45]

Answer:

244.965

Step-by-step explanation:

it is what it is

6 0

3 years ago

What is the y-intercept of y= -.25 + 2?

sp2606 [1]

Answer:

2 (if the -.25 has an x after it)

If not 1.75

4 0

3 years ago

Read 2 more answers

In a class, 60% of the students are girls. There are 18 girls in the class.

Katarina [22]

Answer:

a. Total of 45 students.

b. 18 Boys.

5 0

3 years ago

Read 2 more answers