3 years ago

Expand & simplify (x-2)(x+4)

2 answers:

8 0

You have to FOIL (multiply the first, then outer, then inner, then last)

(x-2)(x+4)

First: multiply x by x to get x².
Outer: multiply x by 4 to get 4x.
Inner: multiply -2 by x to get -2x.
Last: multiply -2 by 4 to get -8.

This gives you:

x² + 4x - 2x - 8

Combine like terms to get your final answer:

x² + 2x - 8

Hope this helped!! xx

Maslowich3 years ago

3 0

I believe your answer will be x² + 2x - 8 hope this helped! :P

You might be interested in

Re-write the quadratic function below in Standard Form y= –2(x + 5)(x – 4)

Naddik [55]

Answer:

y = - 2x² - 2x + 40

Step-by-step explanation:

Standard form of a quadratic is y = ax² + bx + c : a ≠ 0

Given

y = - 2(x + 5)(x - 4) ← expand factors using FOIL

= - 2(x² - 4x + 5x - 20)

= - 2(x² + x - 20) ← distribute parenthesis by - 2

= - 2x² - 2x + 40 ← in standard form

6 0

3 years ago

1/4 :10=x:4 find x I need the answer now

Naily [24]

Answer:

x=1.6

Step-by-step explanation:

Multiply each number by 4 to make wholes and than just cross multiply.

3 0

3 years ago

Each box contains 6 pens as shown in the table. # of Boxes # of Pens 1 6 2 12 3 18 4 Which list includes only independent quanti

konstantin123 [22]

Answer:

pens

Step-by-step explanation:

3 0

3 years ago

When can you use the quotient rule to divide?

adoni [48]

All times. The numbers you are dividing with are quotients.

4 0

3 years ago

Select the correct answer. For what value of x is sin x = cos 19º, where 0°< x < 90°? OA. 38° ° O B. 71° OC. 26° O D. 19°

Lerok [7]

Answer:

x = 71°

Option B is correct answer.

Step-by-step explanation:

We need to find for what value of x is $sin\: x = cos 19^{\circ}$ , where 0°< x < 90°?

Solving:

$sin\: x = cos\: 19^{\circ}\\Finding \:cos\: 19^{\circ}=0.94551\\Putting\:value:\\sin\:x=0.94551\\Now\:taking\:sin\:inverse\\x=sin^{-1}(0.94551)\\x=71^{\circ}$

So, we get x = 71°

Option B is correct answer.

5 0

3 years ago