## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with negative numbers

### Working with negative numbers – Part II

July31

– (-16) = +16 “How do you go from ‘ – (–16)’ to ‘ + 16‘ in your first step?” This is actually a fairly important concept and here’s a mental picture that I ran across in an algebra newsgroup: Imagine that you’re cooking some kind of stew, but not on a stove. You control […]

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### Becoming Connie Confidence with Negative Numbers

July24

Check out this handy website to build greater confidence in working with negative numbers in Mathematics. The target group is Year 7 – e.g.

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#### Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]