Question

Rezolvati in R ecuatiile:a)x²=169;b)9x²=169;c)4x²=-64;d)(x+3)²=49;e)(x-√2)²=8\9

Answer 1

a)x2 =169|=>x=√169=13 sau -13 sunt corecte ambele variante c)4x2=-64|:4 X la a2a =-16=>x=- √16=-4 d)(x+3)2=49=>x+9=49=>x=10

Answer 2

a)x=+13,x=-13
b)nu are sol in R
c)x=+4,x=-4
d)$x^{2} +6x+9=49$
$x^{2} +6x-40=0$
Δ=196
x=4,x=-10
e)$x^{2} -2 \sqrt{2}+2= \frac{8}{9}$
Δ=$\frac{62}{9}$
x=$2 \sqrt{2} + \sqrt{ \frac{62}{9 }$/2
x=$2 \sqrt{2}- \sqrt{ \frac{62}{9}$/2