When solving the equation x2 – 8x - 7 = ( by completing

2 answers:

8 0

X^2-8x-7=0
Add 7 to both sides
X^2-8x=7
Now use formula
(B/2a)^2
(-8/2)^2= 16
Add 16 to left subtract from right to get
X^2-8x+16=-9
Now factor into
(X-4)^2=-9
For your final answer

Ivenika [448]3 years ago

5 0

Step-by-step explanation:

x²– 8x - 7 = 0

(x²-8x+16) -7 = 16

(x²-8x+16) = 16+7

(x-4)² = 23

x-4 = √23

so x= 4+√23 or x= -4√23

You might be interested in

How can you find the least common denominator for 1/8 and 2/9

FromTheMoon [43]

M a t h w a y to find the answer

5 0

3 years ago

Este plzzz.

Yuki888 [10]

Answer:

La superficie es 194.94cm cuadrados

Step-by-step explanation:

¡Espero que esto ayude!

¡Por favor marque el más inteligente!

3 0

3 years ago

. QUIZ You answered 14 questions correctly on a 15-question quiz. What percent did you receive on the quiz? Round to the nearest

Valentin [98]

Answer:90%

Step-by-step explanation:

3 0

3 years ago

A pole, 4m high, stands, vertically, on

Lostsunrise [7]

Answer:

Length of the shadow of the pole is 6.93 metres

Step-by-step explanation:

Given:

Height of the pole = 4 m

The angle sun makes with the horizontal = 30 degrees

To Find:

Length of the shadow of the pole = ?

Solution:

The tangent ratio is the value received when the length of the side opposite of angle theta is divided by the length of the side adjacent to angle theta

Let x be the length of the shadow

According to the tangent ratio

$tan {\theta} = \frac{opposite}{adjacent}$