Question

(3.×-3)²-(2.×-7)=(3.×-5).(3.×+5)​

Answer 1

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Answer 2

Explicación paso a paso:

(3x−3) 2 −(2x−7)=(3x−5)(3x+5)

9x 2 −18x+9−2x+7=9x 2 −25

9x 2−20x+16=9x 2 −25

9x 2 −9x 2−20x=−25−16

−20x=−41

x= 41/20

comprobamos

(3× 2041 −3) 2−(2× 41/20−7)=(3× 41/20 −5)(3× 41/20+5)

( 123/20 −3) 2 −( 82/20−7)=( 123/20−5)( 123/20+5)

( 123/20−60) 2−( 82/20−140)=( 123/20-100 )( 123/20+100 )

( 63/20) 2−(− 58/20 )= 23/20× 223/20

3969 58

400 + 20 =400/5129 400/3969+1160 = 400/5129

400

5129 = 400/5129