Question

Aduceti la forma cea mai simpla expresia
d) (3-2x)(3+2x)+5x²=?
e) 25x²+(7+5x(7-5x)=?
Ajutatima Urgenttt(VA ROG AJUTATIMA DAU CORONITA SI O SA FIU CEA MAI BUCUROASA)

Answer 1

$(3 - 2x)(3 + 2x) + 5 {x}^{2}$

$= {3}^{2} - ( {2x})^{2} + 5 {x}^{2}$

$=9 - 4 {x}^{2} + 5 {x}^{2}$

$= 9 + {x}^{2}$

$25 {x}^{2} + (7 + 5x)(7 - 5x)$

$= 25 {x}^{2} + {7}^{2} - ( {5x})^{2}$

$= 25 {x}^{2} + 49 - 25 {x}^{2}$

$= 49$

Answer 2

d) (3-2x)(3+2x)+5x² =
= 9-4x^2+5x^2 =
= 9+x^2

e) 25x²+(7+5x)(7-5x)=
= 25x^2 +49-25x^2 =49