Question

simplify 3(5c+6d)-2c(d-2) by expanding the brackets and combining like terms.

Answer 1

use the distributive property to expand the brackets
3*5c + 3*6d - 2c*d - 2c*-2

Answer 2

can you continue?

Answer 3

unsure with what to do with the end section

Answer 4

the -2c*-2 ?

Answer 5

with the -2cxd-2cx-2

Answer 6

negative * negative = positive

negative * positive OR positive * negative = negative

Answer 7

-2x * d = -2cd

Answer 8

* i meant -2c * d = -2cd

Answer 9

btw, in algebra we don't use x for multiply (it is easily confused with the variable x)
we either don't use it at all (when we put letters next to each other) or use a dot, or here use an *

Answer 10

note its best to use * for multiplication rather than x to avoid confusion.

Answer 11

I have always wondered why do they bother to teach us to us x for multiply, and then later say, oh, we don't use it any more. But that's the way it is.

Answer 12

yea

Answer 13

Got it! thank you for the rules guys @welshfella @phi

Answer 14

yw