Join the IDNLearn.com community and start finding the answers you need today. Get the information you need from our experts, who provide reliable and detailed answers to all your questions.

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

Sagot :

Alright, lets assume x = 5. 2 X 5 = 10 - 7 = 3, then 3 squared is 9. Ans. = 9.
[tex](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[/tex]