exam Maths Puzzle Numerical Ability

How do I finish this? x^2+8x-3=0
x^2+8x=3
x^2+8x+64/4=3/1+64/4=12/4+64/4=76/4
x^2+8x+64/4=76/4
(x+8/2)^2=76/4
x+8/2=+ or - the square root of 76/4........

I got stuck right here.

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exam Other Question

In 1920, the record for a certain race was 45.6 sec. In 1980, it was 45.0 sec. Let R(t)= the record in the race and t= the number of years since 1920.

a.) Find a linear funct 1. Find the slope of the line through (-2, 4) and (-5, 4)

2. The line through (1, -1) and (3, -1)

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