問題文全文(内容文)：
$(a^2-2a-6)(a^2-2a-17)+18$を因数分解せよ。

2021慶應義塾高等学校

問題文全文(内容文)：
$ a^2+b^2-2(ab+bc-ca)$ $\color{red}{を因数分解せよ.}$

成蹊高校過去問

問題文全文(内容文)：
入試問題　日本大学第二高等学校

$(x^2+3)^2-16x^2$
を因数分解せよ。

問題文全文(内容文)：
Let's enjoy oriental mathematics for just a little while.
You will discover a cute world from mathematics.
Everyone in the world should love and be good at mathematics.

We are introducing the entrance exam questions for Japanese high schools.
It's an important issue for you to understand the basics of mathematics.
Would you like to solve this math problem and check out our commentary?