Is it true?

Algebra Level 2

True or False?

\quad If 4 x − 3 = 5 4x-3=5 , then 64 x 3 − 27 − 180 x = 125 64x^3 -27 - 180x = 125 .

False True

Munem Shahriar by Munem Shahriar , 18, Bangladesh

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3 solutions

Nazmus Sakib
Apr 8, 2017

4x-3=5

or,4x=5+3

or,4x=8

or,x= 8 4 \frac{8}{4}

or,x=2 

     64x³ - 27 -180x


   =64.(2)³-27-180.2


   =64.8-27-360


   =512-27-360


   =125
2 Helpful 0 Interesting 0 Brilliant 0 Confused
Mohammad Khaza
Jul 21, 2017

given that , 4 x − 3 4x-3 = 5 5

or, x x = 2 2

now, 64 x 3 − 27 − 180 x 64x^{3} -27-180x

= 64 × 8 − 27 − 180 × 2 64 \times 8 -27 - 180 \times 2

= 512 − 387 512-387

= 125 125 =true

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Azadali Jivani
Apr 5, 2017

4X=8
X =2
(64(2)^3) -27-180(2)=125 (ans.)

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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