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Thepotemich [5.8K]
3 years ago
8

Grayson evaluated 4x2 + 2y for x = 3 and y = 2.

Mathematics
1 answer:
guajiro [1.7K]3 years ago
5 0
Grayson did not simplify the question
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Perform the operation (x^2+8x+8)+(-10x^2+5x)
PtichkaEL [24]

Answer:

Step-by-step explanation:

(x^2+8x+8)+(-10x^2+5x) = (x^2-10x^2) + (8x+5x) + 8

= -x^2 +13x + 8

4 0
2 years ago
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[Quick Answer Needed] Which of the following shows the extraneous solution to the logarithmic equation?
Nitella [24]

Answer:

C

Step-by-step explanation:

Given the logarithmic equation

\log_4x+\log_4(x-3)=\log_4(-7x+21)

First, notice that

x>0\\ \\x-3>0\Rightarrow x>3\\ \\-7x+21>0\Rightarrow 7x

So, there is no possible solutions, all possible solutions will be extraneous.

Solve the equation:

\log_4x+\log_4(x-3)=\log_4x(x-3),

then

\log_4x(x-3)=\log_4(-7x+21)\\ \\x(x-3)=-7x+21\\ \\x^2-3x+7x-21=0\\ \\x^2+4x-21=0\\ \\D=4^2-4\cdot 1\cdot (-21)=16+84=100\\ \\x_{1,2}=\dfrac{-4\pm 10}{2}=-7,\ 3

Hence, x=3 and x=-7 are extraneous solutions

6 0
3 years ago
Help please! Will give brainly
luda_lava [24]
1.) 9 - c < 2 , C = 7
Graph 7 on the number line.
2.) -3c > 15, C = -5
Graph -5 on the number line.
Hope this helps.
4 0
3 years ago
Find the surface area of a cube with the following side length of 5<br><br> sa=
laiz [17]

Answer:

150 units^2

Step-by-step explanation:

A=6a2=6·52=150

5 0
3 years ago
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A garden in the shape of a right triangle is bordered on one side by a brick wall, on another side by a wooden fence, and on the
MAVERICK [17]
Let
x-----> the measure of the angle formed by the wooden fence and grass

we know that
in a right triangle
tan x=opposite side angle x/adjacent side angle x
opposite side angle x=13 ft
adjacent side angle x=21 ft
so
tan x=13/21x=arc tan (13/21)-----> x=31.76°------> x=32°

the answer is
32 degrees
3 0
3 years ago
Read 2 more answers
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