Chapter 110 Guidance from Master Rong

Song Ranran moved a chair and sat next to Rong Zhou. She leaned forward and saw Rong Zhou open the book, pointing her cold and white fingers at a question.

"Well, that's it." Song Ranran nodded.

"The first and second questions are not difficult. I have already done it. I mainly want to ask you to see the third question. When I first started this question, I guess there was something wrong with the step, and it was unsolvable. Later, I went through the answer analysis later, but the process was written very briefly, so I still don't understand it."

Peach red lips opened and closed, and Song Ranran first explained to Rong Zhou what 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 will also be related to the answers to the previous question, although Song Ranran said that the first two questions were not needed to be explained, Rong Zhou still glanced at it and then focused on the third question.

Half a minute later.

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

rustle--

In a quiet atmosphere, the sound of the pen tip rubbing the paper sounded.

Seeing Rong Zhou's actions, Song Ranran lowered her head and unconsciously came closer to look.

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

After the original function translates a unit, the function equation naturally changes. First make assumptions and obtain the analytical expression of the translated function. Then, appropriate conversion and merge, and become the standard equation format of the parabola to obtain the axis of symmetry.

Rong Zhou simply drew a graph of coordinate drawing and parabola on the paper page with a black pen, and the coordinates of the intersection of the axis of symmetry and the x-axis were marked in the middle.

Because the question gives the interval and the maximum value within the interval, what is required is the value of a.

So first, we need 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 be there now?"

Song Ranran: "Three kinds?"

Rong Zhou: "Yes."

Song Ranran looked up and blinked.

When she just watched Rong Zhou start drawing pictures, her previous blurry thoughts seemed to become a little clearer. Then Rong Zhou gave her a tip with a pen. Song Ranran's eyes lit up and her thoughts became completely clearer.

Since there are three situations, after analyzing them clearly, just list them and evaluate them according to the conditions.

When she first calculated the answer, she came to the question of the unsolved answer, which actually belongs to one of these three situations.

In the three cases listed, there are two of them that have no solutions, and only the last case meets the requirements of the question.

...

Three minutes later.

Write down the dense numbers and letters.

Rong Zhou wrote the final answer.

In summary, the value of a is 2+root sign 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 at Song Ranran's expression.

"Understood!"

"Rong Zhou, thank you!"

Song Ranran's eyes also moved away from the paper full of steps. When she looked up, she met Rong Zhou's black eyes with inquiry, with curved eyebrows and eyes, like a crescent moon.

Song Ranran was very happy to figure out this question.

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

Thank you for a monthly ticket from Miss Silkage! I found that many times there is this little fairy on the thanks list. She looks familiar and loves you (′‵) I
Chapter completed!