Question

Упростите выражение: $5x^{2} +(3-2x)(3+2x)$
A) $9x^{2}+9$
B) $x^{2}+9$
C) $3x^{2}+3$
D) $x^{2}+3$
E)$3x^{2}+9$

Answer 1

$5 x^{2} +(3-2x)(3+2x)=5 x^{2} +(9-4 x^{2} )=9+ x^{2} \\ \\ Otvet: B$

Answer 2

$5 x^{2} +(3-2x)(3+2x)=5 x^{2} +9-4 x^{2} = x^{2} +9$