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Great Revision Link

August2

IXL (“I excel” – get it?) is a great site to review your Pre-School through Yr 9 Maths skills (this link takes you to the Yr 8┬ásection.) Better still,┬átake your younger brother or sister to this site for them to excel too! To quote from this website;

“IXL’s maths skills are aligned to the 2010 Australian Curriculum, providing comprehensive coverage of maths concepts and applications. With IXL’s national curriculum alignments, you can easily find unlimited practice problems specifically tailored to each learning objective.”

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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)?]

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