Answer:
4x²+x+5.
Step-by-step explanation:
5x²+4x+1-(X²+3x-4).
5x²+4x+1-x²-3x+4.
5x²-x²+4x-3x+1+4.
4x²+x+5.
That would be 6 *3 - 8*0 = 18
Its D
Answer:
the middle number
Step-by-step explanation:
Answer:
The dimensions of the iphone are 2 inches by 7 inches.
Step-by-step explanation:
Given that,
The dimensions of an iPhone are x – 2 and x + 3.
The area of an iphone is 14 sq inches
We need to find the dimensions of the iPhone. It is in the shape of a rectangle. Its area is given by :
![A=l\times b\\\\(x-2)(x+3)=14\\\\x^2-2x+3x-6=14\\\\x^2+x-6-14=0\\\\x^2+x-20=0\\\\x^2+5x-4x-20=0\\\\x(x+5)-4(x+5)=0\\\\(x-4)(x+5)=0\\\\x=4\ and\ x=-5](https://tex.z-dn.net/?f=A%3Dl%5Ctimes%20b%5C%5C%5C%5C%28x-2%29%28x%2B3%29%3D14%5C%5C%5C%5Cx%5E2-2x%2B3x-6%3D14%5C%5C%5C%5Cx%5E2%2Bx-6-14%3D0%5C%5C%5C%5Cx%5E2%2Bx-20%3D0%5C%5C%5C%5Cx%5E2%2B5x-4x-20%3D0%5C%5C%5C%5Cx%28x%2B5%29-4%28x%2B5%29%3D0%5C%5C%5C%5C%28x-4%29%28x%2B5%29%3D0%5C%5C%5C%5Cx%3D4%5C%20and%5C%20x%3D-5)
Neglecting negative value
First dimension = (x-2) = (4-2) = 2 inches
Other dimension = (x+3) = (4+3) = 7 inches
Hence, the dimensions of the iphone are 2 inches by 7 inches.
Try this solution:
Step-by-step explanation:
1) for zeros of the function: x²-6x-7=0; ⇒ x₁=7; x₂= -1.
2) for the vertex of the function: x₀= -b/2a, where a;b;c - numbers from ax²+bx+c=0 (from x²-6x-7=0).
x₀=6/2=3;
y₀= (4ac-b²)/4a; ⇒ y₀= -16.
It means, the coordinates of the vertex are (3;-16).