Question

reyolva in R ECUATIA
4X²-25=0

Answer 1

4x²-25=0⇔(2x-5)(2x+5)=0⇔
2x-5=0
2x=0+5
2x=5
x=5/2

2x+5=0⇔
2x=0-5
2x=-5
x=-5/2

S={5/2 ; -5/2}

Sper ca te am ajutat!!!

( /-inseamna supra)

Answer 2

a²-b²=(a-b)(a+b)

4X²-25=0
(2x-5)(2x+5)=0

2x-5=0, 2x=5, x=$\frac{5}{2}$
sau
2x+5=0, 2x=-5, x=$- \frac{5}{2}$

x∈{$\frac{5}{2}$, $- \frac{5}{2}$}