Please help me solve this math question (1 Viewer)

[bmcdancer]

-[3z^2 + 7z - ( 2z^2-3z)] + [(8z^2 - [5z- z^2]) + 2z^2]

 

[janetO]

lol that really confused me but i think this is it ><

-[3z^2 + 7z - ( 2z^2-3z)] + [(8z^2 - [5z- z^2]) + 2z^2]

= -[3z^2 + 7z - 2z^2 + 3z] + [8z^2 - 5z + z^2] + 2z^2]

= -3z^2 - 7z + 2z^2 - 3z + 8z^2 - 5z + z^2 + 2z^2

= 10z^2 - 15z

 

[cxlxoxk]

I don't think this is general maths is it? it looks confusing.

 

[wixxy2348]

I got...

-[3z^2 + 7z - (2z^2 - 3z)] + [(8z^2 - [5z - z^2]) + 2z^2]
= -3z^2 - 7z + 2z^2 - 3z + 8z^2 - 5z + z^2 + 2z^2
= [-3z^2 + 2z^2 + 8z^2 + z^2 + 2z^2] + [-7z -3z -5z]
= 10z^2 - 15z

 

[PC]

-[3z^2 + 7z - ( 2z^2-3z)] + [(8z^2 - [5z- z^2]) + 2z^2]

This probably looks a lot better when you write it like this.
–[3z² + 7z – (2z² – 3z)] + {[8z² – (5z – z²)] + 2z²}
= –[3z² + 7z – 2z² + 3z] + {[8z² – 5z + z²] + 2z²}
= –[z² + 10z] + {[9z² – 5z] + 2z²}
= –z² – 10z + {9z² – 5z + 2z²}
= –z² – 10z + 9z² – 5z + 2z²
= 10z² – 15z

 

[burger125]

This probably looks a lot better when you write it like this.
–[3z² + 7z – (2z² – 3z)] + {[8z² – (5z – z²)] + 2z²}
= –[3z² + 7z – 2z² + 3z] + {[8z² – 5z + z²] + 2z²}
= –[z² + 10z] + {[9z² – 5z] + 2z²}
= –z² – 10z + {9z² – 5z + 2z²}
= –z² – 10z + 9z² – 5z + 2z²
= 10z² – 15z

the power thing makes it a whole lot easier to understand

btw i got the same answer

 

[kevinx2]

I don't think this is general maths is it? it looks confusing.

because General is totally not confusing at all in any way shape or form amirite

got 10z^2 - 15z btw

 

[PC]

Well, the General course does require you to simplify algebraic expressions, including grouping symbols, but it would be very unlikely to see an exam question like this. No harm in practising this though!

 

[rowdyroddy]

this isnt general lol