book Maths Puzzle Numerical Ability

x^2+3x+1 - sqrt(x^2+3x+1)=8

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book Other Question

Write the equation of the line passing through (-3,-5) and (3,0).

Thanks i think i'm in the right place. this is a problem my daughter and I have worked on. given a line segment RW, point T is midpoint of RS, W is midpoint of RT, Z is midpoint of WS. L