3 years ago

What are the solutions to the quadratics equation 2x+ + 6x – 20 = 1

Mathematics

1 answer:

kodGreya [7K]3 years ago

3 0

Math I hate math bc it sucks

You might be interested in

The sum of two numbers is 68. The second number is 2 more than twice the first.

e-lub [12.9K]

Answer:

22 and 46

Step-by-step explanation:

let

one number is x

another is 2x+2

now 2x+2+x=68

or, 3x+2=68

3x=66

or x=66/3=22

so one number is 22 and another is (22X2+2)=46

4 0

3 years ago

All of the following ordered pairs satisfy the function rule y = -2 x - 1 except _____. Plz help (-2, 3) (0, -1) (2, -5) (-1, -3

Kruka [31]

Start by plugging in all your answer choices and see which ones make the solution true

6 0

4 years ago

Solve 3x2 = −12x − 15. x = −4 ± 2i x = −4 ± i x = −2 ± 2i x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

3 years ago

Expand 4x(7x-11) For maths Help please

harina [27]

Answer:

$28x^2-44x$