Brewer Bush
01/16/2023 · Junior High School
8. Axpand and simplifo: a) \( (x+4)(x+6)+(x-1)(x+7) \) b) \( (2 x+5)(3 x-7)+2(4 x+9)(2 x-11) \)
UpStudy ThothAI Solution
Tutor-Verified Answer
Step-by-step Solution
好的,我们来简化这两个表达式。
a) \( (x+4)(x+6)+(x-1)(x+7) \)
首先,我们展开每一项:
1. \( (x+4)(x+6) = x^2 + 6x + 4x + 24 = x^2 + 10x + 24 \)
2. \( (x-1)(x+7) = x^2 + 7x - 1x - 7 = x^2 + 6x - 7 \)
然后将它们相加:
\[
(x^2 + 10x + 24) + (x^2 + 6x - 7) = 2x^2 + 16x + 17
\]
所以,a) 的简化结果是:
\[
2x^2 + 16x + 17
\]
b) \( (2x+5)(3x-7)+2(4x+9)(2x-11) \)
同样,我们先展开每一项:
1. \( (2x+5)(3x-7) = 6x^2 - 14x + 15x - 35 = 6x^2 + x - 35 \)
2. \( (4x+9)(2x-11) = 8x^2 - 44x + 18x - 99 = 8x^2 - 26x - 99 \)
然后计算 \( 2(4x+9)(2x-11) \):
\[
2(8x^2 - 26x - 99) = 16x^2 - 52x - 198
\]
现在将所有项相加:
\[
(6x^2 + x - 35) + (16x^2 - 52x - 198) = 6x^2 + 16x^2 + x - 52x - 35 - 198 = 22x^2 - 51x - 233
\]
所以,b) 的简化结果是:
\[
22x^2 - 51x - 233
\]
总结:
a) \( 2x^2 + 16x + 17 \)
b) \( 22x^2 - 51x - 233 \)
Quick Answer
a) \( 2x^2 + 16x + 17 \)
b) \( 22x^2 - 51x - 233 \)
Answered by UpStudy AI and reviewed by a Professional Tutor
UpStudy ThothAI
Self-Developed and Ever-Improving
Thoth AI product is constantly being upgraded and optimized.
Covers All Major Subjects
Capable of handling homework in math, chemistry, biology, physics, and more.
Instant and Accurate
Provides immediate and precise solutions and guidance.
Try Now
Ask Tutors
Ask AI
10x
Fastest way to Get Answers & Solutions
By text
Enter your question here…
By image
Re-Upload
Submit