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(2x-7)² i've forgotten how to solve this, please help me!!!

(2x-7)² i've forgotten how to solve this, please help me!!!
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3 votes
(2x-7)² i've forgotten how to solve this, please help me!!!

User Mayer
by
8.4k points

2 Answers

5 votes
Alright, lets assume x = 5. 2 X 5 = 10 - 7 = 3, then 3 squared is 9. Ans. = 9.
User Reddspark
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8.0k points
1 vote

(2x-7)^2=(2x-7)(2x-7)=2x\cdot2x+2x\cdot(-7)-7\cdot2x-7\cdot(-7)\\\\=4x^2-14x-14x+49=4x^2-28x+49\\\\\\or\\\\\\(2x-7)^2=(2x)^2-2\cdot2x\cdot7+7^2=4x^2-28x+49\\\\(a-b)^2=a^2-2ab+b^2
User Giorgos
by
8.0k points
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