exam Maths Puzzle Numerical Ability

I get it while shes doing it on the board. I get the math book examples, when it comes to the problems I freeze. It never looks the same as the examples X#$#@!

Read Solution (Total 0)

exam Other Question

solve x^2-x-30

and

solve 2x62+8x-16
I hope someone can please help me with this problem.
Assume the variablex>-9 and use the factx^2+18x+81=(x+9)^2to find x^2+18x+81(there is a square root symbol over the last part