exam Maths Puzzle Numerical Ability

x+8=12

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exam Other Question

f(x)=2x2-7x+3
find f(2)
find f(-3)

that is 2x squared
Checking my math: Can someone shows the steps and solution? Thanks

Simplify using the power rule.

5y^3(y^5)^2
____________
10y^5(y^2)^6