x_5=-10_2x
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a. 6 . x - 5 = 19
6 . x = 19 + 5 = 24
x = 24 : 6 = 4
b. 4.(x-12) = 9 + 17
4.(x-12) = 26
x - 12 = 26 (Hoang mang tột độ :))
Chắc là \(q\left(x\right)=x^2-4????\)
\(f\left(2\right)=2^5+2^2+1=37\) ; \(f\left(-2\right)=-27\)
Do \(f\left(x\right)\) có 5 nghiệm nên f(x) có dạng:
\(f\left(x\right)=\left(x-x_1\right)\left(x-x_2\right)\left(x-x_3\right)\left(x-x_4\right)\left(x-x_5\right)\)
\(\Rightarrow f\left(2\right)=\left(2-x_1\right)\left(2-x_2\right)\left(2-x_3\right)\left(2-x_4\right)\left(2-x_5\right)=37\)
\(f\left(-2\right)=\left(-2-x_1\right)\left(-2-x_2\right)\left(-2-x_3\right)\left(-2-x_4\right)\left(-2-x_5\right)=-27\)
\(\Rightarrow\left(2+x_1\right)\left(2+x_2\right)\left(2+x_3\right)\left(2+x_4\right)\left(2+x_5\right)=27\)
\(A=\left(x_1^2-4\right)\left(x^2_2-4\right)\left(x_3^2-4\right)\left(x_4^2-4\right)\left(x^2_5-4\right)\)
\(A=-\left(2-x_1\right)\left(2-x_2\right)\left(2-x_3\right)\left(2-x_4\right)\left(2-x_5\right)\left(2+x_1\right)\left(2+x_2\right)\left(2+x_3\right)\left(2+x_4\right)\left(2+x_5\right)\)
\(A=-37.27=-999\)
\(=\dfrac{x-5+3x+15-2x-6}{\left(x-5\right)\left(x+5\right)}\cdot\dfrac{x+5}{2}\)
\(=\dfrac{2x+4}{x-5}\cdot\dfrac{1}{2}=\dfrac{x+2}{x-5}\)
\(x-5=-10-2x\)
\(\Rightarrow x+2x=-10+5\)
\(\Rightarrow3x=-5\)
\(\Rightarrow x=\frac{-5}{3}\)
x-5= -10-2x
(-) x+2x =5-10
(-) 3x = -5
(-) x= -5/3