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Which of the following is a quadratic equation?
15𝑥55𝑥3=𝑥−5\frac{15𝑥^5}{5𝑥^3}=𝑥−55x315x5=x−5
21𝑥33𝑥2−21𝑥+10=5\ \frac{21𝑥^3}{3𝑥^2}−21𝑥+10=5 3x221x3−21x+10=5
9𝑥=== 5+++ 12𝑥
21𝑥2−31𝑥=6𝑥221𝑥^2−31𝑥=6𝑥^221x2−31x=6x2
21x6−62x4−732=021x^6-62x^4-73^2=021x6−62x4−732=0
(52𝑥+7)2=0
121x2−33100𝑥=5121x^2−\frac{33}{100}𝑥=5121x2−10033x=5
31x3=5x2+x31x^3=5x^2+x31x3=5x2+x
9x2−5=109^{x^2-5}=109x2−5=10
7x100−98=57x^{100-98}=57x100−98=5
Which of the following is a quadratic equation?
5623x4−2−6738x−2−5=6582x−9+75623x^{4-2}-6738x^{-2-5}=6582x^{-9+7}5623x4−2−6738x−2−5=6582x−9+7
4543x−2+4−565x3−1=434x−21+234543x^{-2+4}-565x^{3-1}=434x^{-21+23}4543x−2+4−565x3−1=434x−21+23
yyy =144xxx+12
5𝑥2+10𝑥=-2
x3x−21𝑥+10=5\frac{x^3}{x}−21𝑥+10=5xx3−21x+10=5
15𝑥5−2−31𝑥=615𝑥^{5−2}−31𝑥=615x5−2−31x=6
66x2=(2x)3−566x^2=(2x)^3−566x2=(2x)3−5
5x5−3+6𝑥−9=215x^{5-3}+6𝑥−9=215x5−3+6x−9=21
-5 =9xxx+5𝑥-𝑥2
72𝑥3=9
It is done.