## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with Solving for x

### Some Common Math Errors

November6

Errors #1: This image shows a student’s working. What went wrong? Well, obviously x should = 17, not the square root of 17. Perhaps a better way to explain the error is like this: When solving equations (expressions with an equal sign) like this, remember the algebraic rule: “Whatever you do to one side, do […]

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### Quadratic Equations are used in everyday situations!

September10

The question was begging. After all, the teacher had just introduced the concept of Quadratic Equations by walking the students around the school quad – which is really an “x squared”! Then, after solving some simple quadratic equations, the question was asked, “What use are these Quadratic Equations in real life”? Well click on the […]

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### Solving simple Linear Equations

July4

This site offers some good, graded exercises to solve for variables, along with solutions. Other revision topics are also available: LINEAR EQUATIONS – Solve for x in the following equations. x – 4 = 10         Solution 2x – 4 = 10         Solution 5x – 6 = 3x – 8         Solution           Solution          Solution 2(3x – 7) + 4 (3 x + 2) = 6 (5 x + 9 […]

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#### Post Support

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

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)?]