3 years ago

1

Mathematics

1 answer:

patriot [66]3 years ago

5 0

I would say probably A

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Solve x^2 − 4x = 14.

DENIUS [597]

Minus 14 from both sides
x²-4x-14=0
use quadratic formula because we cant factor

for
ax²+bx+c=0
$x= \frac{-b+/- \sqrt{b^2-4ac} }{2a}$

so
1x²-4x-14=0
a=1
b=-4
c=-14

$x= \frac{-(-4)+/- \sqrt{(-4)^2-4(1)(-14)} }{2(1)}$
$x= \frac{4+/- \sqrt{16+56} }{2}$
$x= \frac{4+/- \sqrt{72} }{2}$
$x= \frac{4+/- 6\sqrt{2} }{2}$
$x= 2+/- 3\sqrt{2}$

the solutions are
x=2+√3 and
x=2-√3

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3 years ago

What is the product of 2x + y and 5x - y +3?

lianna [129]

Answer:

7x+3

Step-by-step explanation:

2x+y

5x-y+3

Then you solve it by crossing out the y and adding the x’s.

7x+3

4 0

3 years ago

Mark and Mike are brothers. The sum of their ages is eleven. Mike's age is ten

ivann1987 [24]

Answer:mark is 7. Mike is 4

Step-by-step explanation:x+y=11. Y=2x-10 thus substituting for y in equation1 we have x+2x-10=11. 3x-10=11. 3x=11+10. 3x=21. X=21/3. X=7. Mike =(2×7)-10=14-10=4

8 0

3 years ago

Read 2 more answers

From a to D which graph represents a function ? And why ?

tatiyna

Option D I believe because it is the only one that passes the vertical line test (the test that for every X value, there is only 1 Y value).

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4 years ago

Simplify 4[X + 2(3x – 7)] = 22x – 65

Yanka [14]

Answer:

x= -(3/2) OR x= -1 1/2