Need answers lol ( I suck at math)

It's honestly been years since I did maths like that. I don't even remember shit like this.

How do non-uni fags even remember this stuff? It's been almost 6 years and I still haven't used an applied this sort of material to anything.

>>331368
What's with all the high schoolers needing help with their math homework?

>>331368
I feel for you dude. Been there done that. I got a degree after the service at 32 yo.

One of the most wonderful math books for self-study was K.A Stroud's Engineering Mathematics. It spoonfeeded a stupid dude like me. I still had to do the hard work though, but for me it made things easier.

>>331368

>2x * -3
>5x * -3
>8 * -3 when 8 doesn't even an x

the hell you are doing there? You are making it MUCH too complicated.
In 1 all you do is putting in -3 for x in the polynomial and then calculate the result.
2*(-3)^2 +5*(-3) - 8 =?
The 8 isn't affected by the -3 at all because it doesn't have an x.

2 is removing brackets by multiplication
a*(b+c) = ab+ac , a,b and c here just are products

3 again is removing brackets my multiplication, 5x(3x-2) = 5x3x - 5x2 = 15x^2 - 10x, be aware in the full expression that is a minus bracket, so switch the + and - around, 12x - 15x^2 + 10x +18x^2 , caclulate the result.

4 is just using the minus bracket rule, remeber, brackets around a sum can be removed wwhen positive, otherwise again + and - have to be switched around, -(3a-2b+c) -> -3a+2b-c , put in and caclulate the result.

5: Area of a rectangle = a*b --> b=area/a , so it's division by 4x. Division is the same as multiplication (/4 = *(1/4)), so
(24x^2 + 72x)/4x = 24x^2/4x + 72x/4x = 6x + 18 --> A

6, as written in, multply everything once with everything,
3m*2m + 3m*(-3) + 1*2m + 1*(-3)
=6m^2 -9m + 2m - 3 = 6m^2 -7m - 3 --> B

>>331368
>I suck at math
you don't suck at math, you just don't study properly.

your answer to #1 is classic for students who hunt for bizarre patterns that they think will make math easier rather than actually trying to understand what's going on. ironically making it much more difficult than it actually is.

>>331447
there's nothing to even forget on this paper, almost everyone solves problems just like these routinely in their everyday lives.