The school goddess, she becomes more and more beautiful

Chapter 110 From God Rong's Counseling
Song Ranran moved a chair and sat next to Rong Zhou. She poked her head forward and saw Rong Zhou opened the book, pointing to a question with his cold white fingers.

"Well, that's the way." Song Ranran nodded.

"The first question and the second question are not very difficult. I have already done it. I mainly want to ask you to look at the third question. When I first started to do this question, I guess there is something wrong with which step. I can figure it out. There is no solution. Later, I looked through the answer analysis at the back, but the process of it was written very briefly, so I still don’t understand it a bit.”

The pink lips opened and closed, Song Ranran first explained to Rong Zhou the situation she encountered.

After listening to Song Ranran's words, Rong Zhou understood the general idea.

"I see."

He responded in a low voice, then lowered his eyes to look at the function question.

Because the third question of many questions is also related to the answers to the previous questions, although Song Ranran said that there is no need to explain the first two questions, Rong Zhou still glanced at it, and then focused on the third question.

After half a minute.

Rong Zhou looked away from the topic, then reached out and took out a white sheet of paper and a black signature pen from the table.

rustle--

In the quiet atmosphere, the sound of the nib rubbing against the paper can be heard.

Seeing Rong Zhou's movements, Song Ranran lowered his head and unconsciously moved closer to look.

With just a few strokes, a function image appeared on the blank manuscript paper.

After the original function is translated by a unit, the function equation will naturally change. First, make assumptions and obtain the analytical expression of the function after translation.Afterwards, appropriate conversion and merging are performed to become the standard equation format of the parabola, and the axis of symmetry is obtained.

Rong Zhou used a black pen to simply draw a graph of coordinates and a parabola on the paper, marking the coordinates of the intersection point of the axis of symmetry and the x-axis in the middle.

Because the title gives the interval and the maximum value in the interval, what is required is the value of a.

So first of all, it is necessary to know how many situations there are when this maximum value appears.

Rong Zhou saw Song Ranran looking down, he simply drew a few strokes on the picture with a black pen, and asked her lightly: "How many situations do you think may happen now?"

Song Ranran: "Three types?"

Rong Zhou: "Yes."

Song Ranran raised her head and blinked her eyes.

When she watched Rong Zhou begin to draw a picture just now, her previously blurred thoughts seemed to become a little clearer, and after Rong Zhou reminded her with a pen, Song Ranran's eyes lit up, and her thoughts became completely clear.

Since there are three situations, after the analysis is clear, just list them down and evaluate them according to the conditions.

When she did the calculation for the first time before, it was actually one of these three situations that she found that the answer was unsolvable.

Of the three cases listed, two are unsolvable, and only the last case meets the requirements of the topic.

……

3 minute later.

Write down those dense numbers and letters.

Rong Zhou wrote the final answer.

In summary, the value of a is 2+square root five.

The tip of the pen paused, and a small black dot suddenly appeared on the white paper.

"Do you understand now?" Rong Zhou stopped writing and looked up to see Song Ranran's expression.

"Understood!"

"Rong Zhou, thank you!"

Song Ranran's gaze also moved away from the page full of steps, and when she raised her head, she met Shang Rongzhou's black eyes with questioning intentions, her brows and eyes curved like a crescent moon.

After figuring out this question, Song Ranran was very happy.

She looked up at Rong Zhou, her round almond eyes widened, reflecting the lamp beside the table, it was incredibly bright.

　Thanks to Miss silkage for voting for a monthly ticket!I found this little fairy in the thank you list many times, she looks familiar, I love you (′‵)I L
　　
　
(End of this chapter)