the main formula is (cd)(x)=c(x).d(x) 
If c(x) = 4x – 2 and d(x) = x2 + 5x
so (cd)(x) = (4x – 2)(x2 + 5x)=4x^3+20x²-2x²-10x=4x^3+18x²-10x
so the answer is A: 4x^3+18x²-10x

4 0

3 years ago

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Write the equation of a circle with a center at (-1,2) and a radius of 7

Sever21 [200]

Answer:

$(x+1)^2+(y-2)^2=49$

Step-by-step explanation:

The standard form for the equation of a circle is $(x-h)^2+(y-k)^2=r^2$ where r is the radius, and the center is (h, k).

(h, k) = (-1, 2), r = 7

$(x-(-1))^2+(y-2)^2=7^2\\\\(x+1)^2+(y-2)^2=49$

5 0

3 years ago

When X=18, Y=14. Find the value of x when y=42. A) 32 B) 18 C) -18 D) 54

Karolina [17]

Answer:

D)54

Explanation:

hope this helps you...

4 0

3 years ago

PLS HELP ME!

sveta [45]

Answer:

Step-by-step explanation:

the answer is :

$4 \sqrt{7} + 8 = x \\ aproximatly \: 18.58$

with phithaghoreth law you can find the base of the two triangles

and then you sum

if you need more explanation tell me

5 0

3 years ago